The six Flute Sonatas of J.S. Bach fall into two groups of three. In Nos. 1-3 the composer provided a concertante keyboard part, where the right hand is as musically important as the flute and bass lines, apart from the occasional passage when he reverts to a figured bass. Nos. 4-6, however, adopt the four-movement pattern favoured, for instance, by Telemann. In printed sheet music format.