Music has become such a big part of the Roblox community for one major reason: Starting in late 2013, users became able to upload their own MP3s to the platform, which other players can access.

Janzen Madsen is a 25-year-old game designer from New Zealand. Madsen creates new games on Roblox and updates his previous games to keep up a revenue stream. He made nearly $40,000 in his first ...