When I connect Apple Music to my Bluetooth speaker (Sony HT-X8500) directly (in the Apple Music app itself) there is a brief burst of random data noise at the beginning and end of every track. This does not happen when the Mac's output is changed from Internal Speakers to the Sony Bluetooth speakers. I cannot reproduce this when using the Apple Music on my iPhone, so this is specific to Music (version 1.0.1.37) on Catalina 10.15.1. The noise is extremely loud and always occurs, albeit briefly, presumably some data that is being played as audio.

There is no firmware available for the speakers, and it does not occur on other Bluetooth speakers I own (B&W and Logitech). This error is also very present when using FaceTime, in fact it then produces noise continuously throughout the call (when using the Sony via Bluetooth).