Chris Willman Music WriterA 77-track benefit album for a voting rights organization will be released as a download on Bandcamp Friday, for just one day before it disappears — and the list of artists and previously unreleased tracks is intriguing enough to inspire a full-on onset of carpe diem.The second volume of “Good Music to Avert the Collapse of American Democracy” includes an even more impressive lineup than the first, and like its predecessor, will be available for 24 hours, starting at