Claim: Led Zeppelin released an album.
Evidence: Although the group was initially unpopular with critics , they achieved significant commercial success with albums such as Led Zeppelin -LRB- 1969 -RRB- , Led Zeppelin II -LRB- 1969 -RRB- , Led Zeppelin III -LRB- 1970 -RRB- , Led Zeppelin IV -LRB- 1971 -RRB- , Houses of the Holy -LRB- 1973 -RRB- , and Physical Graffiti -LRB- 1975 -RRB-.