Jelaskan "Apologize" - OneRepublic dari Penghargaan Grammy ke-51

Best Pop Collaboration with Vocals

"Lessons Learned" - Alicia Keys & John Mayer

"4 Minutes" - Madonna, Justin Timberlake & Timbaland"Rich Woman" – Robert Plant & Alison Krauss"If I Never See Your Face Again" - Maroon 5 & Rihanna

"No Air" - Jordin Sparks & Chris Brown