Looking for something to blow my mind

incredible string band (played woodstock ).........pentangle ..........procul harlem .....spirit.......humble pie .........hawkwind .......floyd......

 

Yes - Relayer

 

Here are some great bands:
New Ridders of the Purple Sage
Canned Heat (Hooker n Heat w/John Lee Hooker is great!)
Flying Burritto Brothers
Hot Tuna
John Mayall
Moby Grape
Quicksilver Messanger Service
Robin Trower
Rory Gallegher
Ten Years After
Traffic

There is so much great music out there, (A Life Without Music Would Be a Mistake)

 

Arthur Lee & Love
Spirit
The Association
The Band
Vanilla Fudge
Alice Cooper

 

cat stevens

 

DUde defintely check out Pink floyd's first LP, Piper at the Gate of Dawn, it will blow your mind sober. also check out Jethro Tull's Aqualung for some good prog/hard rock.

 

There was a progressive rock band called UK, featuring Allan Holdsworth on the guitar. Quite a listening experience. Check out their song "In The Dead Of Night", if you ever get a chance.

I believe YES has been mentioned already, and rightfully so. The song "Roundabout" is a classic.