Taylor Swift and LL Cool J, the original hosts of this special five years ago, return as hosts of this live hour, in which the year’s Grammy nominations are announced – and which, this year, emanates from Nashville for the first time. Even so, the program is a little bit country, and a little bit rock and roll. Country stars Dierks Bentley and The Band Perry are among the scheduled performers – but so are Maroon 5, fun., and, by satellite from New York, The Who.