later years. In the 1830s, Onslow's quartets were in the repertoire of the Müller Quartet, which played them at the Meiningen court of Duke Bernhard II, and of the Prague-based quartet of Friedrich Pixis the younger. In 1831 Onslow was elected the second Honorary Fellow of the Philharmonic Society of London (Felix Mendelssohn had been the first). He wrote for the Society his Second Symphony, Op. 42, and continued to maintain close relations with leading London musicians including John Ella and George Frederick Anderson. In 1834, Frédéric Chopin and Franz Liszt played Onslow's Grand Sonata for four hands Op. 22 at their debut joint performance in Paris. From 1835 to 1838 Onslow was the President of the in Paris, an association founded in 1829 "to propagate the study and the spirit of music", with the intention of bringing together both amateurs and professionals. The year 1837 saw the premiere in Paris of Onslow's third (and last) opera Le duc de Guise. In 1839 Onslow founded the "" in which the émigré Polish violinist Alexandre Tarnowski was very active. Performances were given of Onslow's own chamber music, and also of his opera Guise, including passages which had been cut from the Paris performances. At the instigation of Tarnowski, Onslow also hosted in Clermont-Ferrand the Polish-Jewish xylophonist and rival of Josef Gusikov, Sankson Jakubowski. In 1842 Onslow's wealth increased on the death of his father-in-law, who owned extensive property. In the same year his French musical prestige was consolidated when he succeeded Luigi Cherubini as a member of the Académie des Beaux-Arts. Invited to the Aachen music festival in 1846, in the following year, on what may have been his last journey outside France, Onslow conducted his Fourth Symphony in Cologne, at the . During his last years he wrote a number of pieces for large chamber ensemble with piano, including quintets, a sextet (Op. 77b) and a septet (Op. 79); he also wrote a nonet (op. 77a) for strings and woodwind. Onslow died unexpectedly (although after a period of declining health) in Clermont-Ferrand in 1853, after taking a morning walk. Onslow was made a Knight of the Legion of Honour in 1837. Music Onslow was a prolific composer of chamber music (including 36 string quartets and 34 string quintets). He also wrote 10 piano trios, three performed operas (an early opera, Les deux oncles, remains in manuscript) and four symphonies, apart