Chris Willman Music WriterThe Academy of Country Music Awards are underway in Las Vegas, for the show’s first streaming-only webcast, via Amazon Prime Video, its first at the cavernous Allegiant Stadium, and its first compacted into a two-hour, commercial-free format. Dolly Parton is hosting.The show will be even more performance-heavy than a typical awards show, with music segments said to be lasting up to a half-hour without interruption.Following is a list of winners as they come up on the webcast, with the triumphant contenders in bold.Several winners were announced in the days or even hour before the 8 p.m./5 PT showtime.