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(Sarah) Isabella (Auguste) Dulcken married a gentleman called Braun.
On 15 May 1836, the concertina player was born in London, and passed away on 27 July 1899 in Munich. The individuals in question were Heinrich Dulcken, who was employed as a music teacher and organist, and Auguste née Burghaagen. It has been established that she was the sister of Sophie Dulcken and the niece of Louise Dulcken.
It is evident that Isabella Dulcken was a student of Giulio Regondi (1822-1872). The temporal extent of the learning relationship remains undetermined. Between 1848 and 1854, Isabella Dulcken performed concerts in collaboration with her sister in a number of European cities, including Weimar, Vienna, Frankfurt am Main, Leipzig, Berlin, Wrocław, Warsaw, Moscow, St. Petersburg, Paris, as well as in the Netherlands and Belgium. Furthermore, he performed in concert with other musicians. In 1854, the subject established themselves in Paris with the intention of delivering educational instruction. Er is bewees van transacties met de Londense concertina-fabrikanten Wheatstone & Co. tot 1862, die worden toe­geschre­ven aan Isabella Dulcken. There is compelling evidence to suggest that, as early as 1855, she had already established contact with Wheatstone & Co. In July 1864, she entered into matrimony with Johann Philipp Otto Braun (1824-1900), who had been employed as the chief editor of the Augsburger Allgemeine Zeitung for a considerable number of years. In 1865, a male child was baptised in Augsburg with the name Heinrich Alfred (died before 1894). In 1872, a female child was baptised in Augsburg with the name Sophie Ottilie Friederike Isabella (died 1894).

Her repertoire comprised original compositions for concertina by Regondi and Blagrove, as well as transcriptions of violin compositions by Artôt, Bériot and Vieuxtemps.
Isabella Dulcken is known to have assisted Giulio Regondi in the popularisation of the concertina on the European continent. The harmonica instrument was invented in the 1820s by the Englishman Charles Wheatstone. The de concertina, a musical instrument that enjoyed a high level of popularity in Great Britain, particularly among female instrumentalists, was a relatively unknown instrument in German concert halls and faced challenges in establishing itself there. Notwithstanding, Isabella Dulcken and her sister received considerable acclaim for their concerts, which they gave in German-speaking countries from 1848 onwards. In 1850, the following was written in "The Musical World" concerning a concert performed by the brothers and sisters in Munich:

„Mdlle Isabelle approaches, as nearly as possible, her excellent preceptor Regondi. We have not heard the concertina since played with so much real cleverness. The young ladies are frequently compared by their friends to the Milanollos“.

According to the Neue Berliner Musikzeitung, Isabella Dulcken had successfully extricated the concertina from the morass of triviality. Isabella Dulcken was instrumental in introducing the concertina to the French public. In a review of a series of successful concerts given by the sisters in Paris, the Neue Berliner Musikzeitung observed that the instrument, which was still in its infancy, had become extremely popular in the French capital thanks to the younger sister, Isabella.
The instrument's "curiosity" proved to be a further attraction for the concert audience, in addition to the "friendly appearance" (ibid.) of the two sisters. However, it is important to note that not all of the reviews were favourable towards the instrument. In the "Neue Zeitschrift für Musik", for instance, Isabella Dulcken's performance in Leipzig was reviewed as follows: "The performance on the concertina was of a very high standard and extremely beautiful, but the instrument is not suited to this type of concert." No further justification was provided. During a concert in Weimar, Isabella Dulcken was criticised for her "non-substantial" repertoire, or so the reports say. However, she countered this by stating that "for her instrument, the concertina, there is no better option".

(Sarah) Isabella (Auguste) Dulcken (Londen, 15 mei 1836 – München, 27 juli 1899) was een bekende bespeelster van de concertina in de 19e eeuw. 

Biografische gegevens 

• Volledige naam: Sarah Isabella Auguste Dulcken (na haar huwelijk bekend als Isabella Braun).
• Geboorte: 15 mei 1836 in Londen.
• Overlijden: 27 juli 1899 in München.
• Instrument: Ze was een virtuoos op de concertina. Hoewel haar techniek werd geprezen als "heel goed", was er destijds kritiek op de geschiktheid van het instrument voor klassieke concertzalen en op het gebrek aan kwalitatief repertoire voor de concertina. 

• Grootouders: Johann Ludwig (Louis) Dulcken II, een koninklijke pianomaker, en de bekende pianiste/componiste Sophie Lebrun.

(Sarah) Isabella (Auguste) Dulcken, Dulcken, getrouwd Braun
15 mei 1836 in Londen, † 27 juli 1899 in München, concertina speelster. Haar ouders waren Heinrich Dulcken (muziekleraar en organist) en Auguste née Burghaagen. Ze was de zus van Sophie Dulcken en nicht van Louise Dulcken.
Isabella Dulcken was waarschijnlijk een leerling van Giulio Regondi (1822-1872). Er is niets bekend over de duur van de leerrelatie. Tussen 1848 en 1854 gaf Isabella Dulcken concerten met haar zus in Weimar, Wenen, Frankfurt am Main, Leipzig, Berlijn, Wroclaw, Warschau, Moskou, St. Petersburg, Parijs, Nederland en België. Ze speelde ook met andere muzikanten op concerten. In 1854 vestigde ze zich in Parijs om les te geven. Er is bewijs van transacties met de Londense concertina fabrikanten Wheatstone & Co. tot 1862, die worden toegeschreven aan Isabella Dulcken. Daarvoor was ze al in 1855 aantoonbaar in contact gekomen met Wheatstone & Co. In juli 1864 trouwde ze met Johann Philipp Otto Braun (1824-1900), jarenlang hoofdredacteur van de “Augsburger Allgemeine Zeitung”. In 1865 werd in Augsburg een zoon Heinrich Alfred gedoopt († vóór 1894), in 1872 een dochter Sophie Ottilie Friederike Isabella († 1894).


Haar repertoire omvatte originele composities voor concertina van Regondi en Blagrove en bewerkingen van vioolcomposities van Artôt, Bériot en Vieuxtemps.
Samen met Giulio Regondi hielp Isabella Dulcken de concertina in Europa te populariseren. Het harmonica-instrument werd in de jaren 1820 ontwikkeld door de Engelsman Charles Wheatstone. De concertina, die erg populair was in Groot-Brittannië, vooral onder vrouwelijke instrumentalisten, was een relatief onbekend instrument in Duitse concertzalen en had moeite om zich daar te vestigen. Desondanks kregen de concerten die Isabella Dulcken samen met haar zus vanaf 1848 in Duitstalige landen gaf regelmatig veel bijval. In 1850 schreef “The Musical World” over een concert van de broers en zussen in München:

„Mdlle Isabelle approaches, as nearly as possible, her excellent preceptor Regondi. We have not heard the concertina since played with so much real cleverness. The young ladies are frequently compared by their friends to the Milanollos“.

Volgens de “Neue Berliner Musikzeitung” had Isabella Dulcken “de concertina van de trivialiteit gered”. Isabella Dulcken introduceerde het onbekende instrument ook bij het publiek in Frankrijk: “De [sic] concertina, hier nog weinig bekend, werd in Parijs zeer populair door de jongere zus [Isabella]” schreef de “Neue Berliner Musikzeitung” over een succesvolle reeks concerten van de zussen in Parijs.
De “curiositeit” van het instrument was een verdere attractie voor het concertpubliek, naast de “beminnelijke verschijning” (ibid.) van de twee zussen. Niet alle recensenten waren echter gecharmeerd van het instrument. Het “Neue Zeitschrift für Musik” schreef bijvoorbeeld over een optreden van Isabella Dulcken in Leipzig: “De uitvoering op de concertina was heel goed, heel mooi, maar het instrument hoort niet thuis in deze concerten”, zonder hiervoor verdere redenen te geven. Tijdens een concert in Weimar kreeg Isabella Dulcken kritiek op haar “niet-substantiële” repertoire, zij het met het excuus dat “voor haar instrument, de concertina, nog geen beter kruid is gegroeid”.

• Johannes Daniël Dulcken (21 april 1706 – Antwerpen 11 april 1757) x Susanna Maria Knopffllin
• Johannes Lodewijk (Louis)Dulcken I (1735 - † tussen 1793 en 1795 München) x Catharina Koning
• Johannes Lodewijk (Louis) Dulcken II (1761 - † München 1836) [brother Johannes Dulcken ( 26 December 1768 - †?)] Louis Dulcken x Sophie Le Brün

Brün, (Sophie Le), the daughter of the famous Bavarian court musician Ludwig August Le Brün, and the great singer Franziska Le Brün, née Danzi, was born in London on 20 July 1781, learnt the basics of music in Munich with Knechtl, the piano with Streicher, and the basso continuo with Schlett, and married the royal Bavarian mechanical piano maker Johann Ludwig Dülken in Munich on 18 April 1799. She is a true artist on the piano in every respect, and plays this instrument with spiritual expression, true feeling and extraordinary skill. When she travelled to Paris, Switzerland and Italy, her excellent playing enchanted every listener, and connoisseurs and artists conceded her the first rank in this art. In addition to this, she sings very well, has a deep insight into the essentials of music, combines her great practical musical knowledge with theoretical knowledge to the same degree, and has a thorough understanding of composition. She has composed several concertos, sonatas and the like for the piano; it is a pity that they have not become generally known through engraving or printing. On 25 June 1831 Louis Dulcken relinquished his post as royal keyboard instrument maker; he died five years later. In his will Dulcken named as heirs his wife Sophie Lebrun (b London, 20 June 1781–d Munich, 23 July 1863), his sons Theobald and Heinrich, his married daughters Louise and Franziska Bohrer, and his then unmarried daughters Violande, Johanna, and Caroline Dulcken. Theobald as business manager and Heinrich as builder apparently completed their father’s commitments after his death but soon closed the shop. Both sons eventually moved to London where Theobald became a wool merchant and Heinrich an organist. Louise and Franziska had married the brothers Max and Anton Bohrer; Louise became court pianist in Stuttgart. Violande became a concert singer in Munich. Dulcken's son Theobald became Louis partner about 1816, and the business continued until 1831, when Louis Dulcken retired.

Théobald Dulcken 1800-1882 Married in 1828, Munich, Bavière, Allemagne, to Louise Marie David 1811-1850 Heinrich Dulcken, organist, 1801 Married to Auguste Burghaagen Louise Sophie Dulcken 1803-1857 Married to Maximilian Caspar Anton Bohrer 1785-1867 Franziska Dulcken 1805-1873 Married to Joseph Anton Bohrer 1783-1863 Violanda Dulcken, prix du Conservatoire de Paris 1810-1863/ Married 18 April 1837 (Tuesday), Munich, Bavière, Allemagne, to Jean François Adolphe Bouvier 1802-1862

Ferdinand Quentin Dulcken (1837–1901)
Sophie (Louise Auguste) Dulcken 6 March 1835 in London, † 15 July 1923 in Dinard (Brittany), pianist
(Sarah) Isabella (Auguste) Dulcken, Dulken, married name Braun