[SOLVED] To Klaus: question about a music clip

Hi Klaus,

https://krpano.com/plugins/soundinterface/

At the bottom of this page linked above there is an example of the sound interface which plays a music file.

Is it royalty free music?
Music: Ding Dong Merrily On High (Anthony Clarkson)

If no, can you give me an idea what you did to be able to use it.

Thanks.