How do you arranges songs in your player? By alphobet order? Types? Singers?

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I've got over 400 songs/pieces of music in my MP3 players and I've tried several ways to get them well organized. My player allow to play all the pieces in one file so at first I named my files like ' pop', 'classical''rock' etc and but more and more I find that could still be annoying and confusing, so I've created new files according to different languages under different musical gengres. Also sometimes I categorize songs by their features such as 'calme', 'peaceful', or 'sad' in case that I'll be loving to listen to proper music under some certain moods. Still because music in one file will be played in alphobetic order, I feel like skip some certain ones and repeat some others all the time. So what's your way to arranges songs in your players? Do they work well for you?