All of a sudden I had some kind of credibility as a songwriter. That was just one of my three-chord wonders. I played bass for the first half of the song. I was very high on heroin. That riff just floated right through me.
Drugs can be a shortcut to creativity.
All throughout history, medicine men and priests in all those primitive cultures used drugs to get to that spirit place. Ask any writer. But for a lot of writers, getting to that uninhibited place is difficult. So it's a shortcut just to have a beer. And it works for a while.