This year's ACM awards show in Las Vegas opened with Brad Paisley bringing Alabama back on stage for his new song "Old Alabama."  How can you top that?  With American Idol judge, Steven Tyler coming out to join Idol winner Carrie Underwood for her hit "Undo It" and then going into his Aerosmith hit "Walk This Way."

Sugarland's Jennifer Nettles teamed up with Rhianna for her pop tune "California King Bed."  The Zac Brown Band and James Taylor not only sang "Colder Weather" but Taylor's hit "Sweet Baby Jane."   One of the shows highlights came when Darius Rucker and 25 developmentally disabled kids from the Lifting Lives music camp shared their song written by Chris Young called "Music of the Heart."  Proceeds from the song will go to the Vanderbilt Kennedy Center.  Learn more on the program and the song here.

We also heard new music from Reba, Martina, Dierks, Sugarland and Blake Shelton.  There was even a rap/country tune from Jason Aldean.  What was your favorite moment of the show this year?