What are the best Classic Rock bands?

While subjective, most Classic Rocks fans would all agree that Led Zeppelin, The Who, Pink Floyd, Cream, The Doors, Queen, The Rolling Stones, Yes, Jimi Hendrix, Jefferson Airplane, The Moody Blues and Allman Brothers would all make the list.  There are many others like the Beatles and Grateful Dead etc that might be considered Classic Rock but also fall in other genres.