from Sonic Youth:
"Sweet Shine" - EJSTNS, for the song itself and the extra noise pc. with the japanese loop. But mostly the song just feels so right, it's got a great sense of completion.

to many others to mention, but a few:

Jane's Addiction "Classic Girl" - RDLH ("good night".... classic!)
Mudhoney "Mudride" - Super Fuzz B.M.
Mudhoney "Check Out Time" - EGBDF
Mudhoney "Acetone" - Piece of Cake
Beck "Debra" - Midnight Vultures (defies description)
Mazzy Star "So Tonight That I Might See" - same album
Primus "Arnie" - Brown Album ("remember this day".... epic)