This was VERY HARD. I kept going back and forth between scenes, but I had to choose one. I decided to go with basically the entire Finn-Tribute Episode. But especially Rachel singing Make you feel my love. Since unfortunately it wasn't only the character that passed away, all of the emotions in the episode were very much real and you could see that in this song. :(
Shoutouts:
Santana, Mercedes and Tina singing Shake it out to Beiste
School Shooting
Blaine's Teenage Dream (S5)
Rachel and Finn breaking up at the end of S3
Santana's Mine and Songbird