Answer: harmony

AnswerCrossword Clue
HARMONY

Sympathetic notes?

HARMONY

Barbershop specialty

HARMONY

Barbershop feature?

HARMONY
Friendly relations
HARMONY
Backup vocal part
HARMONYAccord
HARMONYTogetherness
HARMONYDoo-wop staple
HARMONYMusic major's course
HARMONYChoir's concern
HARMONYAgreement.
HARMONYMelody.
HARMONYPeace.
HARMONYBarbershop-quartet specialty
HARMONYConcord
HARMONYCombination of pitches