I'm a big fan of prog, metal and classic 70s rock eg. Bowie, Queen. Pink Floyd etc.
My 5 favourite bands:
Yes, Jethro Tull, Tangerine Dream, Banco Del Mutuo Soccorso, Devil Doll
Honourable mentions:
Hawkwind, Black Sabbath, Arena, Pendragon, Fish era Marillion, Pink Floyd, Rush, Gong, King Crimson, Dream Theater, 70s Genesis, Iron Maiden, Camel etc.