The 20th anniversary edition of the annual Rock for Kids Rock & Roll Charity Auction (set to take place December 5 at Chicago's Park West) has amassed an unbelievable list of participants who have pledged to donate goods to raise funds for the city's homeless and underprivileged youth.

Devoted chroniclers of the Canadian music scene may already be hip to Clues, the musical project of Alden Penner (the Unicorns) and Brendan Reed (Arcade Fire), also featuring Montreal music scene staples Ben Borden, Lisa Gamble, and Nick Scribner.

New supergroup development! Brian Chase, drummer for the Yeah Yeah Yeahs, Colin Stetson, touring saxophonist for the Arcade Fire, and Stuart Bogie and Jordan McLean, Antibalas' tenor saxophone and trumpet player, respectively, have joined Balkan Beat Box guitarist Jeremiah Lockwood for the Sway Machinery, whose self-titled debut EP is set to arrive September 16 via JDub.

Last night's surprise appearance by Arcade Fire's Win Butler and Regine Chassagne onstage during the Bruce Springsteen concert in Ottawa -- jamming on the Boss' own "State Trooper" and Arcade Fire's "Keep the Car Running" -- was no surprise to Spin. Springsteen and Butler hooked up last week in New Jersey at a shoot for the December cover,