The hottest trend in music in 2011? Throat surgery! Following the recent lead of John Mayer, Adele, R. Kelly, and KISS’s Paul Stanley, Keith Urban — the Australian country music star and Nicole Kidman spouse — will go under the knife later this month. The details of these surgeries vary, but they’re all pretty gnarly-sounding: polyp-removals, hemorrhage treatments, and abscess-drainings, etc. So — why? Our five best guesses, after the jump.