Here is the next one! And the first one in this season where it only has one lead singer (Or in this case, it's more like 2)

Applejack - Alto 2 (Lowest part)
*Bass line
Twilight Sparkle - Alto 1 (Second Lowest Part)
*Percussion/Phone Message at the end
Rainbow Dash - Soprano 2 B (Third Lowest Part)
*Lead Vocals (Beyonce's Part)/Harmony
Pinkie Pie - Soprano 2 A (Third Highest Part)
*Lead Vocals (Lady Gaga's Part)
Rarity - Soprano 1 B (Second Highest Part)
*Ahhs
And Fluttershy - Soprano 1 A (Highest Part)
*Harp