The pop music community has started to mobilize in the wake of the tragedy of Japan's devastating earthquake and tsunami. Simon Cowell announced via Twitter yesterday that he is putting together a Japan relief single that will include contributions from Justin Bieber, Britney Spears, and Katy Perry. This morning he added more names including Jessie J and X Factor alumni JLS, Olly Murs, One Direction, and Cher Lloyd. In the wake of last year's Haiti earthquake, Simon Cowell spearheaded the charity single "Everybody Hurts" which sold nearly 500,000 copies in its first week of release.

Elsewhere, major pop stars have been busy in the efforts to aid Japan. Lady Gaga is selling a Japan prayer bracelet with all proceeds going to earthquake relief efforts. A wide range of stars are encouraging donations to the Red Cross through their Twitter sites. Music For Relief is mobilizing and already has a tsunami relief t-shirt designed by Mike Shinoda of Linkin Park available to encourage donations. Download to Donate makes new music available for free download with the receipt of contributions to aid Japan relief. Watch for more news as the music community once again mobilizes in the face of tragedy.

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