Led Zeppelin released an album.
Led Zeppelin . Although the group was initially unpopular with critics , they achieved significant commercial success with albums such as Led Zeppelin ( 1969 ) , Led Zeppelin II ( 1969 ) , Led Zeppelin III ( 1970 ) , Led Zeppelin IV ( 1971 ) , Houses of the Holy ( 1973 ) , and Physical Graffiti ( 1975 ) . Their fourth album , which features the track `` Stairway to Heaven '' , is among the most popular and influential works in rock music , and it helped to secure the group 's popularity . Each of their nine studio albums placed in the top 10 of the Billboard album chart and six reached the number-one spot .