I've been getting a few requests to use my music in videos, and other things lately, so to save us all the trouble: Yes, you can use my music wherever you'd like for non-commercial usage. Just credit me by linking back to my Newgrounds page.
If you want to use my stuff for commercial usages, just shoot me a message, and we'll see if something can be arranged.
If you are using my music for something (like a game, or a video), please post a link to it on this post! Seeing my stuff being used makes me happy inside.