Already moaned about this in the “Song title association” thread, but I had a ticket to see the Ramones play live in Liverpool (1980?) - had always wanted to see them live - and they cancelled just beforehand to mime “Baby I love you on TOTOP instead.......grrrrrr
Re OP -
Greg Lake (most people only know for his Christmas hit single)
Slade - known for their chart singles, but like The Sweet actually a really heavy band live
Landscape - a funky jazz fusion band in the early “80’s, but only known for the synth pop “Einstein a go-go”