Categories > metal, Categories > jazz, categories > EDM.
This will play everything of one genre.
Alternatively: create a playlist (.m3u) of your music and use that for your specific listening sessions.
@gregc, i just have things tagged normally and use whatever file name it came with when i acquired it. That way i can either play individual albums in track order via browse or i can play the clusterf*** of songs from category view. I feel like it would be super fantastic if you could long-press the play button on a folder in browse mode and have that queue up songs. So that way if I want to listen (in album/track order) to 2-4 different artists, i could just long press the play/pause/ok button and have it consecutively add folders. Or for the multi-disk albums i could easily queue them up without interrupting the music between plays.