AllMusic (previously known as All Music Guide and AMG) is an online music database. It catalogs more than 3 million album entries and 30 million tracks, as well as information on musical artists and bands. It launched in 1991, predating the World Wide Web. AllMusic was launched as All Music Guide by Michael Erlewine, a "compulsive archivist, noted astrologer, Buddhist scholar and musician." He became interested in using computers for his astrological work in the mid-'70s and founded a software company, Matrix, in 1977. In the early '90s, as CDs replaced vinyl as the prevalent format for recorded music, Erlewine purchased what he thought was a CD of early recordings by Little Richard. After buying it he discovered it was a "flaccid latter-day rehash." Frustrated with the labeling, he researched using meta data to create a music guide. In 1990, in Big Rapids, Michigan, he founded All Music Guide with a goal to create an open access database that included every recording "since Enrico Caruso gave the industry its first big boost".