Gentle Giant is the ultimate prog band in my opinion. Only the first 8 studio albums though....i.e. Gentle Giant, Acquiring The Taste, Three Friends, In A Glass House, Free Hand, Power and Glory. DON'T GET Missing Piece, giant for a day, last steps....they are bad!!!! There are many obscure bands from late sixties/early seventies that haven't been mentioned yet like Pidgeon s/t, Ars Nova s/t, Atomic Rooster, Renaisance (first album is the only one i like...totally diff personel), Family (entertainment, music in a doll's house), Spirit s/t, Sea Train s/t, Wishbone Ash - pilgrimage, Gong Allan Holdsworth, Mahavishnu Orchestra - inner mounting flame, Gnidrolog, Fruupp, The Nice.