Toccata & Fuge on a proper organ for me is one of the most epic pieces of music that I will ever listen to. Bach was a master of his craft and this is his best piece, I feel.
Rime of the Ancient Mariner is different, I'll grant you, but when it goes quiet and the bassline is playing, before the lines "One after one, by the star dogget moon, too quick for groan, nor sigh..." (5 minutes onwards) That really gives me goosebumps and it's a really freaky part of the tune.
The Chain, by Fleetwood Mac is one of the most iconic and recognised pieces of music in the sporting world. Go to 3.03 and listen to the bassline and the solo, which takes me all over the world, with burning rubber and the subtle blend of octane, ether and testosterone, that is F1.
2112 has defined so much about the band Rush, but much more than that, it makes a connection and there is superb writing to it. Plus all three of those guys (Geddy Lee, Alex Lifeson and Neil Peart) are fucking fantastic musicians.