Los Angeles -- For Sunday night's Grammy winners, nominees and just about anyone tangentially related to the music industry in Los Angeles, the actual ceremony was only a jumping off point. From 9 p.m. until the early morning, musicians hit Hollywood, West Hollywood and beyond to toast a year -- 2010, that is -- in which the music industry seemed to have multiple reasons to celebrate. And while the actual Grammy Awards were also upbeat thanks to several memorable performances , the real action last night took place not at Staples Center, but after the telecast in venues miles away from downtown L.A. The major label post-parties held the most sway with artists and industry alike on Sunday night: EMI, Warner and Sony held their annual after-parties and the mood this year was decidedly festive in contrast to recent years past. This year things felt different: Perhaps portending better things to come for an industry reeling from declining record sales (artists such as Lady Gaga...