Wow an old album that rocked your world

@french_fries 
I saw Hot Tuna at the Lone Star Cafe NYC, very small venue, was standing at the bar about 6 feet from Jorma, hard to believe all that music is coming from one guitar.

As to rediscovery:
Blood Sweat and Tears/BS&T/God Bless the Child.
David Clayton Thomas fabulous vocals and the arrangement is top shelf.  Give it a spin. 

Wow, this is great.  Reminds me of how much great music I have not listened to in so long.  Time to dig these up.

John Lee Hooker & Canned Heat - "Hooker N Heat"
some of the best harmonica playing - 11 minutes of "Boogie Chillen" great!! 

I believe it was back in the mid 70's when hi-fi shops were plentiful before the big box stores ran them all out, I went in to one of our local shops to audition some JBL L-100's. The salesman put on Heart's Dreamboat Annie album, flipped the loudness switch on the Pioneer receiver and played the Crazy On You cut.  First time I ever felt bass pound me in my chest. From then on out I was hooked on audio.  

I have most of the albums listed above, and I do listen to them.  Some get placed into a more current rotation.  And then, change the rotation, and so on.  I believe a few very important ones were missed.  Try these... Alan Parsons Project (all of them), Emerson Lake and Palmer (Brain Salad Surgery), Steely Dan (Aja), Stevie Wonder (Inner Visions and Talking Book), Led Zeppelin (all of them), Roxy Music (especially Avalon), Super Tramp (especially Crime of the Century), Jethro Tull (especially Stand Up and Aqualung), The Beatles (all of them), and the list can go on.  Bottom line, there is so much wonderful music from the late 60s through the end of the 70s.  Not that I am stuck in that era alone, but the OP did ask about "an old album that rocked your world".  These all rock my world.  To all, be safe & healthy, and do enjoy the music.