Hi sir,
Yes of course. We used youtube's free audio library.
Here is the links:
YouTube Launches Free Audio Library With 150 Royalty-Free Tracks
http://techcrunch.com/2013/09/25/youtube-launches-free-audio-library-with-150-royalty-free-tracks/
https://www.youtube.com/audiolibrary?feature=blog
Thanks for your response sir.