Guest Penguin Egg (the first poster) is just another of those many voices saying "You there, shut up! You aren't [select one]

talented
authentic
creative
equipped* enough

to make music. There are important, official people whose job it is to make music, so put that instrument away, stop singing, and start buying their stuff!"

People like that are everywhere. The thing to do is ignore them.

*equipped means having the most expensive of any instrument, etc.