I think the best choices are from Selena Gomez, Taylor, JB,(YUCK!!), and Victoria Justice. Other singers are Big Time Rush. The most recommended one, (if you're a boy and you want to express yourself...
Songs like "The Climb" by Miley Cyrus or "Firework" by Katy Perry are great for elementary grades.
a year without rain by Selena Gomez remember December by demi lovato love story by Taylor swift mine by Taylor swift
Love story, any Taylor swift song BEST DAY would be touching...try it
A good song I think is Get It Right by Lea Michele. Also, Rolling In The Deep by Adele, Someone Like You by Adele and Beautiful by Christina Aguilera.