Grammy voters have backed themselves into a corner with U2. The act's 2009 release, "No Line on the Horizon," kind of has to be nominated for album of the year. Voters regularly nominate U2 in the field -- the act won for 1987's "The Joshua Tree" and 2004's "How to Dismantle an Atomic Bomb" -- and U2's prior two releases were Grammy darlings. Though it didn't win, 2000's "All That You Can't Leave Behind" was also nominated for the top prize. Both "Atomic Bomb" and "Leave Behind" spawned plenty of hits and sold into the millions, and both lacked the atmosphere, the grace and the experimental tendencies of "No Line on the Horizon." The latter hasn't spawned a blockbuster such as "Beautiful Day," and it hasn't sold at the pace of U2's recent releases either. It is, however, an artistic triumph. If Grammy voters pass it up, it reinforces the notion of the gala being little more than a popularity contest