GUTS is a nifty little collection of music-inspired traits and weapon tags. Admittedly, I think a lot of the traits are a little bit overly niche/underwhelming, but there's some cool stuff here. GUTS is very stylish - the traits are all very evocative of the songs they're inspired by, and the illustrations are excellent.
I think GUTS is definitely worth checking out, especially if you're a fan of any of the bands it involves the music of.