How do you use starpower on drums?

Well in Rock Band you have to wait until you have the starpower bar filled up to a certain line and then you have to wait for these long lines where you can do a solo which you can hit any drum u want and then at the end of the solo u hit the flashing green note, in Guitar Hero u hit the symbols, i don't have guitar hero: world tour but my friend has it and ive heard other people saying that so try these things out (which ever one you have because u didnt specify it in the question).