Caprice No. 24 in A minor is the final caprice of Niccolò Paganini's 24 Caprices, and a famous work for solo violin. The work, in the key of A minor, consists of a theme, 11 variations, and a finale. It is widely considered one of the most difficult pieces ever written for the solo violin. Niccolò Paganini was an Italian violinist, violist, guitarist, and composer. He was the most celebrated violin virtuoso of his time, and left his mark as one of the pillars of modern violin technique. His 24 Caprices for Solo Violin Op. 1 are among the best known of his compositions, and have served as an inspiration for many prominent composers.