accompaniment (n.)

• accession
• accessory
• accordance
• addendum
• addition
• additive
• adjunct
• adjuvant
• agreement
• alliance
• alto
• annex
• annexation
• appanage
• appendage
• appurtenance
• association
• attachment
• augmentation
• baritone
• bass
• canto
• coaction
• coda
• coexistence
• coincidence
• collaboration
• collusion
• combination
• complement
• concert
• concomitance
• concomitant
• concordance
• concourse
• concurrence
• confluence
• conjunction
• conspiracy
• contemporaneity
• contemporaneousness
• continuation
• continuo
• contralto
• cooperation
• corollary
• correspondence
• descant
• drone
• extension
• extrapolation
• fixture
• increase
• increment
• junction
• line
• offshoot
• parasitism
• part
• pendant
• reinforcement
• simultaneity
• soprano
• supplement
• symbiosis
• synchronism
• synchronization
• synergy
• tailpiece
• tenor
• treble
• union
• unison
• voice