If you like “Theme”, you might also like one of Mountain’s less well known album tracks, a prog rock opus called “Nantucket Sleighride”, from the LP of the same name:
https://www.youtube.com/watch?v=3S77sZnnVY4
If you’re not familiar with it, look up the lyrics. Even for us landlubbers, it’s one that puts a shiver up the spine.
I remember that one. Thanks.