Look at those live performances where the lead guitar is also the lead vocal, is there any one who sings well? What is a band? Only when you do your part well can you be called a team. So if you form a band and want to be the lead guitarist, you'd better find a more reliable lead singer. Like David Ma, Jimmy Hendrix, Xie Si and others mentioned by others, you also know how far their singing is from those pure vocalists who don't even play the piano live.