@class NSString; @interface MPMusicPlayerSystemController : MPMusicPlayerController <MPSystemMusicPlayerController> @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (long long)playbackState; - (void)onSystemServer:(id /* block */)a0; - (void)_establishConnectionIfNeeded; - (id)_nowPlaying; - (id)_queueDescriptor; - (BOOL)_shouldAccessCache; - (void)openToPlayQueueDescriptor:(id)a0; @end