If your favourite iOS music app does not offer an AirPlay icon directly inside the application, you can access AirPlay through Control Center (iOS 7.0 and later):

1. Make sure your AirPlay speaker is powered on and connected to your Wi-Fi network.
2. On your iOS device, swipe up from the bottom of the screen to access Control Center. You will find the AirPlay icon in the lower right-hand side of the screen.