The Bakeey G51 is a budget smartwatch with plenty of storage on which to store music. The device is also IP67 certified and features a large touchscreen display.
https://www.notebookcheck.net/Bakeey-G51-Cheap-smartwatch-launches-with-IP67-certification-4-GB-of-storage-and-up-to-7-days-of-battery-life-for-US-29-99.539447.0.html