If you want to add a soothing background music loop (e.g. to a guided relaxation), I recommend a royalty free music loop site called Looperman.com (or record your own sounds using your smartphone…such as birds singing in your garden).
The audios on Looperman.com are free to download.
All you need to do is sign up.
Once you’ve signed up, do a search by “keyword” (e.g. meditation) in the “Search For Loops” section.