Synonyms for accompaniment

noun

1. That which accompanies as a necessary part of another

   accessory, adjunct, concomitant, consequence, necessary circumstance, appurtenance, attribute, context, appendage, necessary link, attendant condition, attachment, attendant, complement, coexistence, supplement.

2. Incidental music

   accompanying instrument, backup, orchestral part, obbligato, piano part, instrumental music, chords, background music, harmony, minor harmony, subsidiary part, supplementary part, continuo; see also music 1.