I always found the muzak comment ironic considering some of Lennon's output in the 70s....

Would also add Villanova Junction. It's fantastic.

I've always thought it would be an incredible ring walk song for a combat sport.

Including "That's a nice way to start, Johnny...."

Radiohead are incredible at building that climax in a piece of music

It's stunning.

Another Radiohead one for just an almighty peak moment is 2+2=5 from Hail to the Thief. When everything comes in it's like a tornado just hit.

If you mean a sort of musical climax then Climbing Up the Walls- Radiohead is a great one. Actually, Exit music as well.