Premise: Led Zeppelin were an English rock band formed in London in 1968 . 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 ) . With RIAA-certified sales of 111.5 million units , they are the second-best-selling band in the US .
Hypothesis: Led Zeppelin were a band.
Label: ENTAILMENT