The leading music reference book is the New Grove Dictionary of Music and Musicians 2d, which is available in music libraries and large public libraries. A fee-based online version is posted at www.grovemusic.com.
Music industry news is posted on MusicStation. The top selling songs/albums are posted by Billboard.
You can often find out who wrote a song, performed it, or published it, or which songs were written or performed by a particular songwriter or recording artist, by searching databases on the ASCAP, BMI and/or Sesac websites. These are companies that collect royalties for artists when songs are played on the radio or in clubs. SoundExchange collects royalties when songs are played on internet music streaming stations, cable TV music stations and satellite radio.
You can license the right to use songs through the Harry Fox Agnecy ("hfa").
Well-considered album reviews are posted on the Internet for free by the AMG All-Music Guide. A wide array of tour schedules are posted on Pollstar and Cosmo.com.