{primarysources|date=May 2011}} AllMusic (stylized as allmusic; previously All Music Guide or AMG) is an online music guide service, owned by All Media Guide. AllMusic was founded in 1991 by popular culture archivist Michael Erlewine as a guide for consumers. Its first reference book was published the following year. When first released onto the Internet, AMG predated the World Wide Web and was first available as a Gopher site. AMG headquarters is located in Ann Arbor, Michigan, United States.