OK, I'm 56 and living through the LSD era, never wanted any part of that. About 10 years ago, my band was jamming on a beautiful day & a friend offered dome mushrooms. I knew the guy well. He grew them, so we all took them (The other guys are psychedelic veterans). We were jamming pretty well until the mushrooms kicked in. Then we started playing Walking Blues. We played that song at least 1/2 hour & never quite finished it- it just petered out. We went outside for about an hour to watch the grass grow. Everyone was laughing. I swear I could see the chlorophyll pulsing up & down the blades of grass. After about an hour we decided to play another song. Don't remember what, but the results were similar, so went back outside. Didn't get much music done that day.
I tried mushrooms a couple more times. Always enjoyed them, but didn't like investing so much time. After a couple hours I'd be ready to go & do something, but the mushrooms would say "No you're not!"