Forgotten heavy bands from late 60's to early 70's


Have been a fan of hard rock/metal since high school. Always liked the heavy/physcadelic bands equally to the metal bands I grew up with Ozzy-Maiden and Scorpions ect. Recently on Youtube I discovered some heavy/physcadelic bands I was unaware of. 13th Floor Elevators-Five Day Rain-Probe Direction-The Hook and Vahalla. Are these bands albums worth persuing? Feel free to mention any other band that deserves to be heard. Look forward to your responses.
dayglow

Hey, @reubent , I only know the first Godz record though they made two or three if I'm correct.

What era is Patto?

@goofyfoot  - I only have the first, self-titled album from Patto. It was released in 1970. Good album, great first track - "The Man".

One of the best in the field hasn’t been mentioned. Nor are they in The R&R Hall of fame despite their selling out Shay stadium faster than the Beatles. Led Zeppelin refused to play after they opened. That band Grand Funk Railroad

BTW, I like CTS immensely But they are not heavy but progressive and way ahead of their time.

I also saw Iron Butterfly do the entire Metamorphosis album at a nightclub in Ocean City MD back in the mid 70’s. It cost $3 a head. Probably the best $3 I’ve spent. Well worth seeing/hearing

An other one is Gravy Train, Gravy Train @1970, something between Sabbath and Jethro Tull