Just prior to going on stage at every show, Paul McCartney will gather his band to warm up their voices -- either in a spare room backstage or in the shower.

That latter option was the case recently in Warsaw, Poland. Macca and the band ran through the rock and roll classic "Rip It Up," which was recorded by Bill Haley and the Comets, Little Richard, Elvis Presley, Chuck Berry and many others. A video of McCartney's shower performance of this song is now posted on his website.

McCartney's Out There tour hits Seattle on Friday.