Yep! We have purchased the rights to use the music that is available for assignment to tours, and have licenses that allow our customers to use the files for their tours.
You do not have to pay any additional fee to use the music.
We have a license on file (PDF) for each of the audio tracks we provide access to, and that license grants Tourbuzz the ability to make the songs available for use in our tours (but not to download the songs, etc).
If you wish to get a copy of each of those licenses to share with your client(s), please let us know and we'll be happy to share those!