![The Big Four: Live in Sofia](https://image.tmdb.org/t/p/w185/3XnxSUPxjUUnH482l1o6aJrysKx.jpg)
Premium player has no ads, which is available for premium members only
Click here to purchase premium to remove all the ads
Backup singers live in a world that lies just beyond the spotlight. Their voices bring harmony to the biggest bands in popular music, but we’ve had no idea who these singers are or what lives they lead, until now.