If you’ve got a huge music library and don’t want to bother shuffling songs on and off your iPhone, consider using Google Music instead. The service, which is currently free, holds up to 20,000 songs, which you can stream from computers, phones and tablets. Although Google hasn’t released an official app for iPhone, the third-party gMusic app works as an excellent stand-in. It supports playlist editing, offline listening and lock screen controls, so you’ll have no trouble using it in place of Apple’s default Music app.
Link: gMusic