LOS ANGELES (AP) — Robert Plant and Alison Krauss’ unorthodox musical partnership yielded rich rewards on Grammy night, as the pair won a leading four Grammys, including record of the year for the haunting “Please Read The Letter.”At the same moment that the show was going on, teen heartthrob and double Grammy nominee Chris Brown was talking with detectives about an alleged felony assault on an unidentified woman the night before. Police records showed he was being held on $50,000 bail.Brown and longtime girlfriend Rihanna, also nominated, were both slated to perform in different slots of the show, but separately dropped out at the last minute. The victim of Brown’s alleged assault wasn’t identified, and it wasn’t immediately clear whether Rihanna’s absence was related to Brown’s.Jennifer Hudson was there, however, and provided the night’s most emotional moments onstage. The Oscar winner took her first Grammy award — for best R&B album — for her self-titled debut.The Grammy telecast was filled with eye-popping and eyebrow-raising performances, from Radiohead’s collaboration with a college marching band to a televised black-and-white throwback performance from Jay-Z, T.I., Lil Wayne, Kanye West and a very pregnant M.I.A.Coldplay and Lil Wayne each won three Grammys apiece — Coldplay’s win included song of the year for “Viva La Vida.”Lil Wayne was the nominations leader with eight, and won best rap solo performance for “A Milli,” rap song for “Lollipop” and rap/sung collaboration for “Swagga Like Us.”