What Makes it "Grate"?

Not long ago, researchers identified a new singing style specific to mice. Which raises this question—what makes it singing, and makes it...noise? Today on Soundcheck, we speak with John Potter, editor of the Cambridge Companion to Singing. And, Puccini may be a staple of opera houses and an inspiration for Broadway’s RENT, but he’s often regarded as a "guilty pleasure." Author Will Berger joins us with a reassessment of the world’s most popular composer. And, conductor Robert Kapilow offers his perspective on what makes a recording a "must-have."