Origin of the sound files

[niccokunzmann]

Hi,

I am working on releasing the app in F-Droid.
niccokunzmann#1

The question came up, where the sound files are from and whether they can be released under an open-source license.
https://github.com/gita/HanumanChalisa/tree/master/app/src/main/res/raw

Could you clarify, if you know, where they came from? Any hint about their origin may help me, to track down their license and get the app released - with or without sound.

Best,
Nicco