who are the members of this band?
Robert Plant, Jimmy Page, John Paul Jones, and John Bonham.
Led Zeppelin
Led Zeppelin were an English rock band formed in London in 1968. The group consisted of vocalist Robert Plant, guitarist Jimmy Page, bassist/keyboardist John Paul Jones, and drummer John Bonham. 
when was led zeppelin's first album released 12 January 1969
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Led Zeppelin [SEP] Introduction
Led Zeppelin were an English rock band formed in London in 1968. The group consisted of vocalist Robert Plant, guitarist Jimmy Page, bassist/keyboardist John Paul Jones, and drummer John Bonham. With their heavy, guitar-driven sound, they are regularly cited as one of the progenitors of heavy metal, although their style drew from a variety of influences, including blues and folk music. The band have been credited with majorly impacting the nature of the music industry, particularly in the development of album-orientated rock (AOR) and stadium rock. Many critics consider Led Zeppelin one of the most successful, innovative, and influential rock groups in history.