In ancient Greece, Apollo was—among other things—the god of music. In ancient 2012, Apollo became the official music app for CyanogenMod. It was gorgeous, functional, and completely customizable, as you might expect from the world's most popular ROM. At the time, we were told that this lovely bit of software would be coming to the Market "in the coming weeks." That was back when we still called it the Market. Today, though, Apollo is available on the Play Store.
The player comes in two flavors: regular, and +. Apollo+ removes ads and offers quicker updates for a mere $0.99.