Be honest! And give reasons.
I can think of no other tune that does this for me more than Echoes by Pink Floyd.
Not only impressive for it's length and originality, but quite challenging to listen to in parts. Really quality blues funk jam and the epic part at 18 mins or so is just cream worthy, especially the build up to it. Love the drums and the synths, and that percussive bass from 15 mins on, they just keep it so interesting and lively. Amazing production for 1970 too. Sounds timeless.
Also has really deep personal memories for me. So
http://www.youtube.com/watch?v=-KMpZaEF6g0
Actually might be my most favourite piece of music ever written.





