Steve Reich on making good music

"the bedrock of anything I’ve ever done is musical intuition. Whatever ideas I’ve had the test is: how do they sound on Monday, how do they sound on Tuesday, how do they sound next month? And do they keep sounding good? And if they do, then they are good. And if they don’t, then they’re not good" at the Red Bull Music Academy.

http://www.redbullmusicacademy.com/london/lecture-videos/steve_reich_the_music_maker