Tom Morello [ tickets ] made a surprise appearance mid-set during Monday night's (4/7) Bruce Springsteen [ tickets ] concert in Anaheim, CA.

Morello, who in the past recorded and performed a noteworthy cover of Springsteen's "Ghost of Tom Joad" with his band Rage Against The Machine, helped Springsteen and the E Street Band reinvent the song as a full-blown rocker.

Morello's extended guitar solo on the song built to a stunning climax with sonic pyrotechnics that should add to bootleg interest in the show.