Certain apps (eg. DJay) at least seem to have access to audio data from Apple Music streams, either directly or via an indirect dataset for visualization purposes either generated from audio data on the device or delivered from a remote service.
Is there any framework provided by Apple or special agreement with Apple that gives access to Apple Music audio data, or sets of visualization meta data, or the ability to run processing of audio data on device or remotely (either on-demand or via preprocessing)?