Sweet - Poppa Joe
Mud - Rocket
Slade - Gudbuy T' Jane. How Does It Feel is great but a little beyond the GR era.
T.Rex - Ride A White Swan. Children of the Revolution also good.
No mention of Gary Glitter songs in order to avoid unpleasantness and controversy. However, The Glitter Band were very talented in their own right.
Suzi Quatro's three early 70s hits were virtually indistinguishable from one another.
Arguably, some early 70s David Bowie, Roxy Music and Wizzard records could be pigeonholed as Glam Rock, though the fans might disagree. Rebel, Rebel and Virginia Plain are my favourites from DB and RM. Wizzard were very full on but samey.