Premise: 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 ) . They are one of the best-selling music artists in the history of audio recording ; various sources estimate the group 's record sales at 200 to 300 million units worldwide .
Hypothesis: Led Zeppelin played music.
Label: ENTAILMENT