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In page Alex Van Halen:

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In 1972, Alex and Eddie Van Halen formed Mammoth with Mark Stone on bass and Eddie on lead vocals. The band rented David Lee Roth's PA system for their shows. Soon after, Edward became tired of singing lead vocals, and asked Roth to join the band. Later, in 1974, since the name Mammoth was already taken by another band, the name was changed to Van Halen, and Stone was replaced by Michael Anthony.[2] Roth has claimed that it was his idea to rename the band Van Halen, and that he actually named it after Alex. In addition to his musical duties at this time, Alex handled managerial duties, such as booking gigs, etc. for the band. Their 1978 self-titled debut album Van Halen was released to much fanfare, influencing many musicians in hard rock.