i have watched all the shorts to the second movie of Equestria girls and have noticed that hidden in each one there is a hidden concept that shows their element of harmony they each represent:
rainbow dash: chose to keep the guitar that she used against Trixie in a shred-off, even though she wanted the double necked guitar in the beginning
fluttershy: used her tambourine to make the hamsters listen and be kind
pinkie pie: used her optimistic energy to play the drums
applejack: offered to get her bass back for the retail price and was being honest with that and when she showed the flim flam brohters that she very well knows how to play bass
rarity: (i honestly don't know for rarity, she was kind of being super narcissistic in this one)
twilight sparkle: i don't think there is one for twilight yet (except for singing, so yeah, i guess that's magic)
if anyone has anything to say about rarity's plz do :3