"Johann Sebastian Bach used the recorder in two Brandenburg concertos and some twenty cantatas and oratorios, but alas, he left us no sonata with harpsichord," say Julien Martin and Olivier Fortin. Arranging chamber music for a variety of instrumental ensembles was a widespread practice in the eighteenth century. Bach himself seems to have created a number of works that did not necessarily require the use of a specific instrument. Here Julien Martin and Olivier Fortin, musical partners for many years, present the Sonata in F major, originally written for transverse flute and continuo, transcriptions of the Trio Sonata for organ No. 3 in E minor, the Partita for violin No. 2 in G minor, and the Chorale 'Nun komm, der Heiden Heiland', whose extensive ornamental flourishes elongate and transform the chorale melody to the point of rendering it unrecognisable.