The Chaconne is a variation of a variation of musical works in which the main melody is repeated many times, but in different character.
The Chaconne is polyphonic, that is, polyphonic, variations. In the Chaconne theme, while remaining unchanged, traveling to different voices, appearing in the top, middle, bottom.
Widely known of the Bach Chaconne for solo violin. Play it and arranged for piano or organ.
J.S. Bach. Chaconne (fragment from Partita No. 2 in d-moll, for solo violin)