Because this is a generic name used for millions of private files sent through the app, it does not refer to a specific, unique "piece" of music, art, or media available in a public database. The "WA" stands for WhatsApp, and "0018" indicates it was the 18th video file handled by the app on that specific date.
What is the (a person performing, a meme, a landscape)? VID-20190603-WA0018
The identifier is a default filename generated by WhatsApp for a video saved on June 3, 2019 . Because this is a generic name used for
To help identify the "piece" within that video, could you describe: in the video? unique "piece" of music