Multiple genres?

I'm wondering, how can I get Winamp(PC) and Poweramp(Android) To recognize multiple genres on one album? Is it possible? I googled a bit but I didn't really find a clear answer.

I guess you would have to experiment.
Try it with multivalue fields or semicolon or slash or comma or backslash as separators.
WMP for instance allows "semicolon blank" in the field composer, but not in ARTIST. iTunes does not care for semicolons at all.
So try it.