in tune

1 :  in a state in which the correct musical sound is played or sung adjusted the guitar until it was in tune

2 :  in a state in which people agree with or understand one another The president and his followers were clearly in tune. —usually + with The new supervisor is not in tune with the needs of the staff.

3 :  in a state in which one thing agrees with or matches another —usually + with His formal clothing was in tune with the occasion.