Pietro Antonio Locatelli (1695-1764) was an Italian composer and violinist who moved to Amsterdam in 1729. He was a virtuoso violinist, and his compositions are all concertos, sonatas and violin caprices. The twelve violin sonatas of Opus 6,1 published in Amsterdam in 1737, are ¡§considered to be among Locatelli¡¦s best works.¡¨ The sonatas of Opus 6 generally follow the pattern found in No.6: a three movement scheme with a slow first movement, a fast middle movement, and concluding with a third movement set of variations, often on a minuet theme. No. 12 is a surprise, having five movements the last of which is a Capriccio, a predominantly solo movement subtitled ¡§Prova del intonatione.