http://schema.org/musicBy

    3: schema:musicBy has a much smaller domain than actor or director

Reported by Simon Spero @sesuncedu in http://lists.w3.org/Archives/Public/public-vocabs/2015Jan/0056.html

http://schema.org/actor and http://schema.org/director are applicable on:

• Clip
• Episode
• Movie
• MovieSeries
• RadioSeries
• TVSeries
• VideoGame
• VideoGameSeries
• VideoObject

Whereas musicBy only has: Episode, Movie, RadioSeries, TVSeries.

Missing: Clip, MovieSeries, VideoGame, VideoGameSeries, VideoObject.

I see no reason not to make it the same list.

/cc @vholland