Answer:

setthetone

AnswerCrossword Clue
SETTHETONEEstablish a particular mood
SETTHETONEEstablish an atmosphere
SETTHETONEEstablish an attitude
SETTHETONEEstablish a mood
SETTHETONEEstablish atmosphere.
SETTHETONEUse a pitch pipe
SETTHETONEMake it clear how things are going to go