Source code for Lyrics fetching and synchronizing

Hi guys,

I want to build an app wherein songs can be played with lyrics. I have seen apps such as 'Musixmatch' and 'Lyrics Match' which pull the lyrics of the songs which is being played from our local storage. The lyrics are actually synchronized with the music and vocals. I want to incorporate exactly the same thing in my app. Can anyone suggest how do these apps pull the lyrics (synchronized to the music and vocals)? Is there any service available for the same? Or there are other methods with which the same can be done ? I'd be really greatfull if anyone can help me out here.

Regards,
Yash