Bigbang - Long Distance Man

So completely random. Somewhere midday a tiny bit of this song, just a piece of melody, pops into my head, why, what triggered it, I don't know, what I do know is that I've spent the rest of the day trying to figure out what song it was and who's done it, so that I could listen to it, I just knew it was "B" something, and now I finally I got it, thank God, would've been a sleepless night otherwise...