ac·com·pa·ni·ment 
(ə-kŭmpə-nē-mənt, ə-kŭmpnē-)
(ə-kŭmpə-nē-mənt, ə-kŭmpnē-)n.
1. Music A vocal or instrumental part that supports another, often solo, part.
2. Something, such as a situation, that accompanies something else; a concomitant.
3. Something added for embellishment, completeness, or symmetry; complement.