it's cold outside: what's the better known identity of minus 273.15 degrees celsius?

Questions

Gary Puckett sang "Lady Willpower", among others. Name his backup band?

Gary Wright's contibution to Wayne's World.?

Gee Music : Architecht of Bebop who outlived his contemporary C Parker by many decades?

Gee Music : Elevator music maker who had a hit with "songbird"?

Gee Music : Ramones motto "_____ _____ hey!"?