Copyleft

All music provided and produced by me, the grub brother, may be reused under a non commercial creative commons license.

This means that you are free:

To sample, mash-up, or otherwise creatively transform this work for commercial or noncommercial purposes.
To perform, display, and distribute copies of this whole work for noncommercial purposes (e.g., file-sharing or noncommercial webcasting).

Under the following condition:

You must attribute the work in such a manner (e.g. in the credits) that it is recognizable my work was used in yours. You are free to work with it as long as you mention it.

For details see below:

Creative Commons Sampling+ 1.0 License Legal Code.