I could not find widely documented, reliable information about an artist or band named "BellyJay." If this is an emerging or locally active performer, established encyclopedic sources do not appear to provide well-known, broadly verified details about their origin, genres, or period of activity. To maintain accuracy, I cannot supply specific biographical or stylistic claims without reliable public documentation. If you can provide additional context (such as country, notable releases, or associated acts), I can help draft an encyclopedic description based on verifiable facts.