I know there's been topics like this before, but peoples' music interests are always changing.
My favorites are (in no particular order)
Come Together, the Beatles
Because, the Beatles
that song in the end credits of Donnie Darko
Hey Jude, the Beatles
Flying, the Beatles
that "I like marijuana" song by Country Joe & the Fish
Tales of Brave Ulysses, Cream
Blue Condition, Cream
Wigwam, by Bob Dylan
Satellite, Elliot Smith
Miss Misery, Elliot Smith
that "Mad World" song from Donnie Darko
Fire on the Mountain, the Dead
Dark Star, the Dead
Loser, the Dead
Shakedown Street, the Dead (first thing I heard when I tripped on acid for the first time, it has a place in my heart)
Box of Rain, the Dead
Sugaree, the Dead
The Eleven, the Dead
Round Midnight, Thelonious Monk
Well You Needn't, Thelonious Monk
Tea For Two, Thelonious Monk
Orange Lady, Miles Davis
Feio, Miles Davis
Little Blue Frog, Miles Davis
My My Hey Hey, Neil Young
Fly, Nick Drake
These Days, Nico
(really anything on The Royal Tenenbaums soundtrack)
Echoes, Floyd
Bike, Floyd
See Emily Play, Floyd
Jumping Jack Flash, the Rolling Stones
Let It Bleed, the Rolling Stones
Pale Blue Eyes, the Velvet Underground
Who Loves the Sun, the Velvet Underground
I Am Trying to Break Your Heart, Wilco
Do You Realize, the Flaming Lips
Bad Days, the Flaming Lips
God damn, that list got kinda long. But those are all on a special playlist marked "For stoning."