Free

Free is primarily known for the hit "All Right Now," which sounds like a harder-edged, generic version of Rod Stewart and the Faces. The song, and the group itself, created something of a blueprint for the kind of hard rock that was typical of the 1970s: simple music, with prominent guitars and he-man vocals. Defined by Paul Rodgers' semi-soulful singing and repeated use of the words "baby" and "unh," Free's first two records are actually a pretty good combination of British blues and early metal -- sort of a Led Zeppelin that doesn't go to quite the same heights.