Kenny Rogers & The First Edition- Just Dropped In (To See What Condition My Condition Was In)
Crosby, Stills, Nash & Young- Almost Cut My Hair
The Beatles- Sun King
Fleetwood Mac- Safe Harbour
Syd Barrett- Golden Hair

How about the Move and Tyrannosaurus Rex? "Flowers in the Rain" and "One Inch Rock" seem to fit the bill.

The Iron Butterfly Theme by Iron Butterfly

And in my opinion it was the first heavy metal song....but then of course, I was stoned.....

"China Cat Sunflower" Grateful Dead
"Tomorrow Never Knows" Beatles
"The Tide Rushes In" Moody Blues
"Close to the Edge" Yes
"Lucy in the Sky with Diamonds" Beatles

....in no particular order:

I See The Light- Hot Tuna

Money Can't Save Your Soul-Savoy Brown

It's All Over Now Baby Blue-circa '66 Grateful Dead, live...

Waiting For The Sun-Doors

Happenings Ten Years Time Ago-Yardbirds

.................non Rock catagory: Bitches Brew-Miles....and Live In Seattle-Coltrane

Here's my Top 30, in no particular order:

"Child of the Moon" The Rolling Stones
"Eight Miles High" The Byrds
"Dark Star" The Grateful Dead
"Are You Experienced?" Jimi Hendrix
"Slip Inside This House" 13th Floor Elevators
"Glimpses" The Yardbirds
"See Emily Play" Pink Floyd
"The End" The Doors
"You Set the Scene" Love
"Tomorrow Never Knows" The Beatles
"Through My Eyes" The Creation
"I Can See for Miles" The Who
"900 Million People Daily All Making Love" The Seeds
"Journey to the Center of Your Mind" The Amboy Dukes
"Heaven is in Your Mind" Traffic
"Martha" The Jefferson Airplane
"I Can Hear the Grass Grow" The Move
"Unconscious Power" The Iron Butterfly
"Can't Find My Way Home" Blind Faith
"Dance the Night Away" Cream
"Night of the Long Grass" The Troggs
"Children of the Sun" The Misunderstood
"Madman Running through the Fields" Dantalion's Chariot
"My Friend Jack" The Smoke
"Ride My Seesaw" The Moody Blues
"Relax Your Mind" The Frantics
"Hurdy Gurdy Man" Donovan
"I Had Too Much to Dream Last Night" The Electric Prunes
"Psychotic Reaction" The Count Five
"Dark on You Now (Swallow the Sun)" The Peanut Butter Conspiracy

A few for me are...

1. Proud Mary by Creedence Clearwater Revival
2. You Cant Always Get What you Want by Rolling Stones
3.Wonderful Tonight by Eric Clapton
4.Wild World by Cat Stevens
5.Love Me Do by the Beatles

having just taken up guitar, im gonna be working on a few of these great songs...

Psychedelic?...

1 - Spanish Castle Magic - Jimi Hendrix
2 - Purple Haze - Jimi Hendrix
3 - White Rabbit - Jefferson Airplane
4 - Lucy In The Sky With Diamonds - Beatles
5 - Strawberry Fields - Beatles

6 - 7 + 7 Is - Arthur Lee & Love

great lists - thanks for the memories - especially spin spin spin - by h.p. lovecraft. i tried to list ones that haven't been mentioned...
can't believe nobody listed

whitebird - it's a beautiful day...
and there is
4 minutes to 12 - the fugs
tobacco road - blues magoos
broken arrow - buffalo springfield
sky pilot - the animals