, singer and guitarist for the iconic , has already recorded a song for an upcoming CD that's now being put together to support Gary McKinnon, now 43, according to Janis Sharp, McKinnon's mother. who in 2001 broke into computer systems in the Department of Defense, NASA and the U.S. Army.

McKinnon, who was an unemployed system administrator in the U.K. at the time of the 2001 hack, has been using a series of legal maneuvers and appeals over the past seven years to fight .

in November 2002 in the U.S. District Court for the Eastern District of Virginia. He has said he broke into U.S. military computers hoping to uncover evidence of UFOs.

As McKinnon continues to fight extradition, his vocal supporters have been waging their own battle.

Late in January, Boris Johnson, the mayor of London, wrote a newspaper column to call off U.S. efforts to extradite and prosecute the British hacker. Johnson called the U.S. extradition efforts a "legal nightmare" and a "comment on American bullying."