Former Beatles band-mates Paul McCartney and Ringo Starr are to perform at the 56th annual Grammy Awards show in Los Angeles, CBS announced. The lineup for performers will also include John Legend, Macklemore & Ryan Lewis, Kacey Musgraves, Taylor Swift, and Keith Urban. LL Cool J is to return as host of the Jan. 26 event at the Staples Center. The Grammys honor the previous year's best in music.