acid, accoustic, pop,jazz,metal,classical,capella, punk,ambient,bass,blues,club,country,techno,hip-hop,celtic,christianRap,cult,disco,etnic,euro-house,and etc etc..........
Most of the time you can tell roughly what a song tends towards. But since most music looks at so many genres that after a point its ridiculous to keep them in silos. Eg how can you possibly have ONE genre for the Mahavishnu Orchestra across the four albums?