You can use these files in any kind of commercial product (game, video, etc.). This means you can include my music in your game and sell the game and there's no need to ask for my permission or anything.
You can edit the files if you want, I just ask anyone who edits the files to NOT credit me.
You cannot directly sell these files I make available for free. This means you can't create a "music pack" with my music in it and sell it like "RPG music pack 1", or sell the individual files anywhere.