A few weeks ago there was a programme on BBC2 on a Saturday night, ( 4 in total ) and it was stated that when a lead singer sings , the backing music is very slightly behind. Why is this?
sound travels at 330 metres per second. If teh musicians are 3 metres behind the sound takes around 1 hundredth of a second to reach them. then it takes time for them to react to the sound and try to keep up with the singer. Not sure but could be.