It's like a very lame knockoff of Punkomatic. I have no beans with Punkomatic (2 especially has been used to do some very fantastic things).
This however...the rhythm and bass guitars use the same riffs, as do the low and high leads (and they have three fewer than the rhythm!); didn't even bother to look at the drums.
And much unlike punkomatic you can't interrupt a sample because one block equals one riff rather than having one riff extend over three, four, or even five blocks, which severely limits the sort of things you can do with the guitar samples you have here...
The weak-ass pop-shredder chords will get annoying to listen to very fast while you try to piece together a "heavy metal" song.
All in all it's an exceedingly subpar attempt at copying one of the better music toys on the net and Newgrounds does not benefit from having it.