Here they are covering some the song called "Replay" by Iyaz(Thanks Erica!) I am not familiar with it so I have no idea who the original artist is. The video gets cut off though because the person's camera died.
Here are the chords to Breathe by He is We. [Link]
The other day a video by Youtuber Strawburry17 was posted. Strawburry17 also made a video on how she made it: