Earlier today Apple released iOS 13 beta 2 to registered developers fixing several bugs but also adding new features, one of those new features that apple added is Audio sharing:
Audio sharing is compatible with AirPods (1st generation or later) and PowerBeats Pro. iPhone 8 or later, iPad Pro 12.9-inch (2nd generation or later), iPad Pro 11-inch, iPad Pro 10.5-inch, iPad (5th generation or later), iPad Air (3rd generation), iPad mini (5th generation), or iPod touch (7th generation or later) is required. (51331268).
Users can download beta 2 of iOS 13 OTA.