From the land of Robbie Williams, Inexplicable U.K. Music Trend No. 763: The top-selling single for the week ending May 29 was inspired by. . .a ringtone. The Crazy Frog — a mind-bogglingly grating creature who mimics a motor scooter — was mixed into Harold Faltermeyer’s ’80s hit ”Axel F” by German dance act Bass Bumpers; the result outsold Coldplay’s ”Speed of Sound” four to one. Suddenly, a Spice Girls reunion sounds like a welcome touch of sophistication.