Answer:

unison

Answer	Crossword Clue
UNISON	Instance of agreement
UNISON	In complete agreement
UNISON	Togetherness

UNISON	Oneness
UNISON	Complete agreement
UNISON	A choir may sing in it
UNISON	At the same time, with "in"
UNISON	Together, with "in"
UNISON	Concordance
UNISON	In ... (together)
UNISON	Counterpoint counterpart

UNISON	Perfect agreement
UNISON	In ... (together in pitch)
UNISON	Perfect accord
UNISON	Agreement
UNISON	Concord
UNISON	Synchronized sound
UNISON	What singers sing in when they don't harmonize
UNISON	Choral parts may be sung in it

UNISON	Homophony
UNISON	In .. (together)
UNISON	Synchronous action
UNISON	In .. (all together)
UNISON	Same-note singing
UNISON	Coincidence in pitch
UNISON	Concert
UNISON	(In) concert

UNISON	Accord
UNISON	In ... (simultaneously)
UNISON	Harmonious agreement
UNISON	Accord.
UNISON	Harmony.
UNISON	Agreement.
UNISON	Concord.
UNISON	Togetherness.

UNISON	Harmony
UNISON	Choral distinction
UNISON	Simultaneously, with "in"
UNISON	Identity of musical pitch
UNISON	Synchronization