Best Classic/Hard Rock Bands/Artists Of All Time

My list covers all my favorite "Classic Rock" and "Hard Rock" bands from the 60s to the 90s. There are bands/groups that I think are excellent that aren't included, such as Simon & Garfunkel, Righteous Bros., Roy Orbison, Smiths, Depeche Mode, The Monkees, Neil Diamond, Greenday, Thompson Twins, etc. because I wouldn't describe them as Classic or Hard Rock.