Theme song how do I get it to shut up?

[Demidion]

Just got my S4 and it seems like when I leave it alone for a short time a theme song starts to play, I turn the volume down and it doesn't affect it. It does it when locked when not locked and it is annoying the **** out of me, can anyone help?

 

[Demidion]

Ok figured it out, when I restored the backup from the old phone it set the notifications to "unknown ringtone" changing it to the correct ringtone fixed. no more theme song playing over and over and over!