I've said it before and I'll say it again:
ANDREW HUANG OF "SONGS TO WEAR PANTS TO" IS A GENIUS!!!
With the help of Dave from BoyInABand, he has created an alphabetical, 26-genre piece that covers everything from opera, dubstep, xoomii, jazz, Viking metal (!!!) and heaps more in just over three minutes.
Sure, it'll make your head spin. But the depth and breadth of the talent of these guys is indisputable - it knows no bounds. It is expertly done and well worth your time.
WARNING: Mind the strobe effects during the Trap section towards the end.