Accompaniment n. : That which accompanies; something that attends as a circumstance, or which is added to give greater completeness to the principal thing, or by way of ornament, or for the sake of symmetry.

Accompaniment n. : A part performed by instruments, accompanying another part or parts performed by voices; the subordinate part, or parts, accompanying the voice or a principal instrument; also, the harmony of a figured bass.

Example:
How can I convert Accompaniment music from guitar chords?

Taxonomy
accompaniment, accompanist, music, free encyclopedia, melody, instruments, typical accompaniment, accompaniment figure, pitches, van der Merwe, musician, play the melody, music accompaniment, search, pattern, Mozart, concert, aria.

Defination from the web:
accompaniment is the art of playing along with a soloist or ensemble, often known as the lead, in a supporting manner as well as the music thus played. ... An accompanist is one who plays an accompaniment. ...