Local residents and police are 'working in unison' to make the neighborhood safer.
The children recited the alphabet 'in unison'.
singing/playing 'in unison'
(..) una cuenta? Bien, el cajero los atienda inmediatamente. This is a robbery. This is supposed to be a unison recitation. Why do I have to do any of this? He's the one who claimed he knew the language. (..)1969 Butch Cassidy and the Sundance Kid