Not forgotten by me of course, but by the general public:
Pat Travers
J. Geils Band
Atlanta Rhythm Section
Three Dog Night
Uriah Heep
Point Blank
Poco
Golden Earring
Boz Scaggs
Thin Lizzy
Slade
Humble Pie
Mott the Hoople
The Knack
The Hollies
Edgar Winter Group
Robin Trower
Grass Roots
Rare Earth
Edit: There were so many good bands of the 70's and I know there are some I have forgotten to mention
I don't know about you, but I listen to sirius/xm radio and a lot of those bands are still played on the regular classic rock stations, some of those bands I will admit were forgotten besides their hits, but that has to do with single song downloading instead of purchasing a full album, but I ******* love poco, and J. Geils band is a fun band, not the best in the world but fun, and I love atlanta rythym section, but so much of their stuff sounds to same, but The are a good band