CHACONNE, a slow dance, introduced into Spain by the Moors, now obsolete. It resembled the Passacaglia (q.v.). The word is used also of the music composed for this dance—a slow, stately movement in 4 time. Such a movement was often intro duced into a sonata, and formed the conventional finale to an opera or ballet until the time of Gluck. The most famous of all chaconnes is that of Bach for violin unaccompanied—a colossal example which is generally played as an independent piece, though it is actually a movement in one of his violin sonatas (No. 4).