Steven Mackey, a Princeton professor of music, has received Grammy Award nominations for both composition and guitar performance in an ensemble. Mackey is nominated for Best Small Ensemble Performance and Best Contemporary Classical Composition awards for the 2011 recording "Lonely Motel: Music from 'Slide,'" a cycle of 11 Mackey compositions recorded in collaboration with singer Rinde Eckert and new-music sextet Eighth Blackbird. The Grammy Awards are presented by the Recording Academy and will be announced Sunday, Feb. 12, 2012, in Los Angeles, and aired live on CBS beginning at 8 p.m.