Loost Koos is a Finnish hip-hop group (<- not sure if spelled right eh) from its capital Helsinki. It used to make music in English with name Lost Cause but nowadays they're rapping in Finnish. Members of group are DJ Arsi (Karl Dallas), Väiski (Pianomies) and Särre (Payperwork). Särre is the MC, Pianomies producer and DJ Arsi is naturally the DJ. Loost Koos has four albums: Peruna ja timantti (Potato and diamond), Ei väistetä jos ei tunneta (Don't dodge if you don't know), Pienempi kuin kolme (Less than three) and Wincave Mixtape Vol. 1 which was actually published only as a coffer and dig publication.
This song is from the album Pienempi kuin kolme which came out 2012. The name of song "Vainot" means "Persecutions". It tells about man who is always watching the one girl on public transport, usually in a tram; always dreaming about her and "their" future plans but never opens his mouth. In the chorus he repeats "Pään sisään, pää sisään, kaikki mikä pyörii jää sisään" which means that everything what is going on his mind stays on his mind. I truly love this song, it's just so dope.