It's Rainbow's turn to take the lead vocals this time. The song itself has way more going on. But it wouldn't be Mane 6 Acapella if there was more than 6 voices ;)

Applejack - Alto 2 (Lowest part)
*Percussion
Twilight Sparkle - Alto 1 (Second Lowest Part)
*Bass Line
Rainbow Dash - Soprano 2 B (Third Lowest Part)
*Lead Vocals
Pinkie Pie - Soprano 2 A (Third Highest Part)
*Eh Ohs 1
Rarity - Soprano 1 B (Second Highest Part)
*Harmony
And Fluttershy - Soprano 1 A (Highest Part)
*Eh Ohs