The Art of Chanting

Starlight decides that it's best if she and Trixie learn to do a friendship chant

This takes place after Season 8 Episode 20- Road To Friendship

After a rather disastrous road trip to Saddle Arabia, Starlight and Trixie are glad to make it back to Ponyville. However, Starlight wasn't too happy with their improvised friendship chant and drags Trixie along to learn how to do a proper one. Luckily, there are two ponies who are willing to give them a helping hoof.