Each year, the GRAMMY Awards honor artists from various genres as they celebrate the year's biggest musical achievements. Take, for example, country crooner Blake Shelton, nominated for Best Country Duo/Group Performance, and hip-hop legend Dr. Dre, who's in the running for Best Rap Album. 2) Blake Shelton performed "Home" with Usher at a benefit concert.

Source: Yahoo Music
Link: 6 Degrees Of Music Collaboration: Blake Shelton To Dr. Dre