I forgot to do day 20 yesterday so I'll do both day 20 and 21 today

Day 20 - Favorite cover song by Hello, Happy World!

My favorite cover song by that band so far is We Are!

Day 21 - Favorite cover song by Pastel*Palettes

My favorite cover songs by that band so far are Hanamaru Pippis is Just for Good Kids and Luka Luka ★ Night Fever

Credits to Riru for making this challenge board.