These files will be delivered in .mp3 format.
File size varies depending on the track.
They are all in a .rar (or .zip if you prefer) file, and separated into folders.
Each set contains 30 minutes of music. The biggest pledge level contains 8 hours of music. If all stretch goals are reached, the highest pledge levels will receive 10 hours of music total.
Don't see the answer to your question? Ask the project creator directly.