@interface CSAudioPlayingAppMonitor : CSEventMonitor + (id)sharedMonitor; - (void)_stopMonitoring; - (id)init; - (void)_startMonitoringWithQueue:(id)a0; - (void)_systemControllerDied:(id)a0; - (void)_startObservingSystemControllerLifecycle; - (void)_startObservingAudioPlayingState; - (void)handleAudioPlayingStateChange:(id)a0; - (id)playingApps; @end