For all of the music except the track I use for the Inner Chapters, I created it from royalty free loops and include it in the license for each episode. There is a production page on this site with more details. The production page also has the artist and track name for the Inner Chapters’ music and while at one time it was available under a by-sa music sharing license, the artist has since changed the license. I sought and received explicit permission from the artist to use the track for this purpose so I cannot say it is available under a general license any more.