Echoes is a truly sublime mix of doomy art rock and classical structure. It's one of Pink Floyd's greatest moments. An excellent progrock gateway piece. I still play the crap out of it. Played at high volume, it scares the snot out the trick ot treaters on Halloween.

I find parts of side to be a little folky for my taste, though the melody of "Fearless" is really pretty. I still have to always skip "Seamus", sorry.