All of my music is available for free under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 license. Essentially, this means you can download and share it for free; in fact you can use it for any purpose at all, as long as:
  • You say it is by me (Andrew Kay), and link to warfreak2.org.uk (attribution)
  • You don't use it commercially without my permission, which you can probably get (non-commercial)
  • Any derivative work you make must be released under the same license, or a very similar license (share alike)
As long as you stick to those rules, go nuts! Note that this page is not the license itself, merely a summary; you should read the full legal text of the license if you are into that sort of thing.