Random trumpet fanfare sound from Macbook pro "15" retina

I have this problem that really annoys me sometimes it's just that my macbook is making a sound like a trumpet fanfare, and it just happens randomly, not at any specific moments and i have no clue what that could make that sound, i usually only have safari, mail, skype, spotify and league of legends open, and i can't see what could cause the sound, cause there isn't any commercials when the sound comes, and i don't know what to do

Do you have Growl by any chance?
Temporarily disable the notifications by clicking the icon in the upper right hand corner of your menu bar. See if the problem persists.

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Random trumpet fanfare sound from Macbook pro "15" retina

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