This depends on whether the music released under his legal name and his alias are considered the same "project", so to say. Are they all the same style and whatnot, and did he just adopt a performance name at some point?
If he intentionally makes and releases different styles of music under each alias, they should be separate - otherwise, they should probably be merged.
By the way, please don't write all your posts with "artistic" capitalisation - it makes them harder to read (must make them harder to write too!) and that's not very respectful of other people's time