The only problem he is shaking his head probably has to do with his stress level.Check it and make sure it is below 50,if it is too high he will not want to perform.
GotchiGuy 46,you are right.There is either a music game or a concert.If his stress lev.is below 50,then try to disipline him.If that still dosent work,try praising it.If you just can not get it,then just do a care miss.That has happend to me before,his stress was high.