Don't you love when a song pops up in your playlist that is either really encouraging or motivating? It can quickly put your struggles into a different perspective and make you want to keep working harder toward your goal (working out harder, keeping on your diet, give you more energy, etc). Here are a few of mine:
-Won't back down by Tom Petty
-Stronger by Kelly Clarkson
-Sexy and I know it by LMFAO
-Stronger by Kanye West

What are some of yours?