Blue Oyster Cult

Yes they are good, in a straight-ahead 70's rock way. Also they have the sci-fi thing going. There most famous song other than Reaper is Godzilla, which has one of the best riffs ever. Also, two things about their live shows: 1) at one point everyone plays guitar at the same time (including the drummer and keyboard) for a total of 5 guitarists, and 2) the almost always do Born to be Wild (Steppenwolf song, also please see), including a Harley ridden onstage with a topless, busty, uh, rider.

P.S. I had a tenant that a) grew up and played with BOC, and b) (according to him) taught Gene Simmons to play bass.