Listings of the music and the musician that accompanies any of Dr Joe's Meditations can be found on the Product Page for the accompanying meditation on Dr Joe's Website.
You can find the product store using this link:
If you go to the product store and click on the meditation for which you want to know the music, then scroll down the page to see the music and musician listed.
See the example below for Walking Meditation 2:
Meditation Music by Barry Goldstein
Album: Walking with the Divine Music
This information is also listed in the Digital Products section of your account for downloadable each meditation purchased. See the screenshot below for an example of Walking Meditation 2.