goes down?

salam

i recorded this video during my practicum, the same day as Rugby world cup opening. i like this song so much. i tried to find this song on youtube and i couldn't. can someone tell me the tittle of the song please. i've been looking for like forever. i tried to key in some of the words that match this song but still couldnt find it. someone help me please. and yeah, the boys' voices were awesome. i'm stunned.