Ja sisälläni sydän laulaa sävelmää

It's a Käärijä song, of course it's in finnish

He's not gonna be making music in other languages so why wouldn't it be in finnish? But then again, we have song titles like It's crazy, it's party, Sex = money, People's Champion and Trafik so hmm perhaps that is not the reason.

2. It's a deliberate attempt to break Bojan (and Joker Out) to a bigger finnish audience

Listen, they are the sons-in-law! Except, the wider audience still doesn't know them, because they're not played on the radio. Radio is actually still very very important in finland. In fact, this study tells us that

"According to the National Radio Survey, around 85% of Finns listened to the radio weekly in 2024. The Music Listening in Finland 2024 research by Teosto and IFPI Finland highlights radio's importance in discovering new music, with one in three listeners adding songs they hear on the radio to their Spotify playlists."

What is also true is that finnish people very clearly prefer music in the finnish language. From that same study we can see that pop music in the finnish language is far more popular than pop music in english, for example:

According to Yle, finnish people are also listening to more and more finnish music every year, and that audience's consuming of music by native artists is growing much more rapidly in finland than in other nordic countries. In 2024 ALL of finland's spotify top ten songs and albums were by finnish artists who perform in finnish, and taylor swift was the ONLY non-finn on the top ten list of most listened to artists. And she was like. Number 8. So not even in the top three or even top five.

Finland is a very, very difficult market to break into. (So actually maybe let it sink in for a bit that Joker Out has done it at all, to a point where they can headline a festival and play venues with capacities up to thousands of people and sell out. Because according to all of the FactsTM that's like... not supposed to be possible.)

So, having Bojan perform in finnish on this song is just a damn smart move if they want this song to perform well in finland. Like the fact of the matter is that it would NOT perform as well in any other language. It just wouldn't.

And if there is one thing finnish people love, it's an adorable foreigner making an honest attempt at learning our language. If they play this right, Bojan could seriously gain some real attention here.

So it could be a tactical move on top of being a creative choice.

3. Jere (and Allu and Sonny) wrote the song first, Bojan was chosen as the featuring singer after the fact

I do think it's possible that this really doesn't have anything to do with the Tallinn soundcheck shenanigans or anything like that. It's possible that it really did happen organically. That Jere and the boys had a new song, they wanted someone to sing on it, and for obvious reasons (= the song being homosexual) Jere wanted Bojan. And because the song already existed, it was like "hey Bojan, you wanna sing in finnish?" and Bojan being the langauge geek he is obviously said yes.

4. It's because Bojan asked Jere to teach him finnish phrases under the formulalakanat while they were giggling deep into the night after enjoying each others bodies and then Jere taught him all of these unhinged phrases and then they made a song using all of those phrases because they are gay homosexuals who are unable to be normal about each other for one (1) single second and like they think they're oh so clever and funny but in reality they're just kinda unbearable but hey we're here and we're enabling all of this so who is really to blame here i mean we have allowed this to happen and now they are about to have gay sex on a song that will be played to crowds of children the next time someone decides to book koko perheen käärijä to open a sporting event like who even knows maybe they will actually fuck on stage and we'll cheer them on because that's what it's like here these days

5. we wouldn't understand

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tl;dr: gay in finland

EDIT: also i realise i did not answer the original question. it's tuu mun luo because they wanna come (to each other)