David Bowie fans haven't had the easiest decade. It began with our hero suffering a massive heart attack, canceling the remaining dates of his tour and turning completely away from the spotlight. Then, just when it seemed he was gone forever, the Thin White Duke unleashed a surprise album last year. But he didn't promote it with a single live performance or interview and he's since gone quiet yet again. Thankfully, he left behind one of the most impressive catalogs in rock history. Bowie has so many amazing hits that his other songs tend to get overlooked. Here's a look at 20 hidden gems from his catalog.