Celebrating PAX 2008, developer Harmonix released a bundle for Rock Band, offering tracks from Jonathan Coulton, MC Frontalot and Darkest of the Hillside Thickets, all favorites of the Penny Arcade crew.

“Skullcrusher Mountain”, “Livin’ on the Corner of Dude and Catastrophe” and “Shh…” are the songs by the respective artists.

The three-song bundle will sell for 240 Microsoft points ($3), with each track going individually for 80 Microsoft points ($1).

Interestingly, all proceeds from the PAX pack will be donated to the Child’s Play Charity until this holiday season.