Simplify the following text for a Grade 10 native English-speaking person.
Original: Allmusic was founded in 1991 by popular-culture archivist Michael Erlewine as a guide for consumers .
Simplified: All Music was created in 1991 by popular-culture archivist Michael Erlewine and mathematician Vladimir Bogdanov , Ph. D. , as a guide for people who wish to buy music .