Where did the songs in Huawei Health come from?

The music on Huawei watches is transmitted via Bluetooth. How to import the downloaded music into the watch: Please go to the device details page of Huawei Health App and click Music >; Music management > Add Concert automatically jumps to Huawei Music App, clicks "Local Songs", selects the music to be added from the list of songs displayed on the page, and clicks √ in the upper right corner of the page. The music that supports importing watches has format requirements, and the songs displayed on the page represent that the music meets the format requirements for adding music to watches.