All of my VMs run Ubuntu Server, while I typically use Lubuntu for a lightweight client OS. Lubuntu will run on just about anything in my experience, and Ubuntu-based OSes are typically a good intro to Linux.

Download Ubuntu HERE
Download Lubuntu HERE
Ubuntu Documentation HERE

Links to raw audio files & projects below, along with my personal choice of "audio-mastering software", Audacity. Most audio blocks are pretty big, expect a pretty slow download from them.

Raw Files HERE
Download Audacity HERE