Music can make a great remedy for depression, lack of motivation and inspiration, and most of all, boredom in the classroom (and in our lives as well). This website features 25 songs that will surely change the mood of your classes. All videos are accompanied by a brief description.
I would just like to add a couple more uplifting youtube songs:
Victoria's Secret Fashion Show (2007) - Heidi and Seal Duet
if we believe - blues saraceno (with lyrics)
Lost in Space - Lighthouse Family
Why not exploit these questions and ask your students to answer them? Here's the website: