Earlier this week, unofficial word came out that Google wasn't happy with Music's performance to date. I attribute part of the problem to the mediocre music app, though that's something that could be remedied by the unofficial Google Music API in the near future. Despite its shortcomings, some people - myself included - use the app. Others use the app that comes stock bundled with manufacturer UIs (for example, Sense, TouchWiz, and Blur all include their own custom music players). Still others use third-party apps, available on the market or as APKs (for example, Artem uses PowerAmp).
So, what do you use to play music locally? Stock Google, stock manufacturer, or third party?