Keith Caulfield

Keith Caulfield is the associate director of charts at Billboard.

Guardians of the Galaxy

Billboard 200 Chart Moves: 'Guardians' on Cassette Cashes In

On the latest Billboard 200 albums chart, the 'Guardians of the Galaxy' album bowed on cassette tape, Iggy Azalea's second album arrived and Beyonce's self-titled set got the deluxe reissue treatment.