nostr:npub1d7rv3453exqf300wa0and3t6m5z8fj09pn5wj4ky6adf27yrr30q9k7c5g 
A Masterpiece "Karn-Evil 9 Pt 2 impression 1" ... and the most played on radio back in the day...
If you haven't had the opportunity to listen to Parts 1,2,3,4 in succession it is truly a wonderful experience. The album Brain Salad Surgery earns it's name. It ups the music listeners game, Parts 1and 2 is a requirement at the least.

https://www.youtube.com/watch?v=GBYRiK7sOAo&list=OLAK5uy_k0hQMgNN7BQdyXhurRMojLEASGtZlbdGo&index=5