No copyright infringement intended. Flashlight by Jessie J. But this cover was based on Hailee Steinfield's cover of the song. 

Flashlight Acoustic Cover

Piece by piece is an original work of Kelly Clarkson. No copyright infringement intended :)

Piece by Piece (Acapella cover)

An acoustic version cover of "Blame it on the Rain" by He is We. No copyright infringement intended. 

Try by Pink, but this one is based on Jayesslee's cover. No copyright infringement intended.