The document provides information about various music magazines, including:
1) NME (New Musical Express) is a UK-based weekly magazine that started as a newspaper and is now owned by IPC Media.
2) Bauer Media Group owns several UK music magazines including Kerrang, Q, and Mojo.
3) Rolling Stone is a US-based biweekly magazine founded in San Francisco that was started by Jann Wenner and Ralph J. Gleason.
4) Billboard is a US-based magazine that provides information about its large audience which is predominantly between 25-54 years old and has an average yearly household income.