make new pattern (ctrl+return (works best, when you do it on Master)) -> in name place type: "<crack>" -> go to the sequence view (F4) and place it in sequence queue -> when nothing is happening, play the song -> tadaaa!
it's not a joke!
ok, maybe a little

So, when you type '<' in pattern editor it works like a tag or something. What is interesting, different combinations do other things.