No one really knows or cares about what or whom Mouthe is today. But before Mouthe was Mouthe, he ghostwrote B-sides for artists such as 2Pac and Amy Winehouse.
Avicii Boy recognized Mouthe and asked him to ghostwrite a Billboard #1. That didn't happen. Mouthe kept that song for himself. This time he went public with music under his own name. Although, still choosing to stay faceless.