Wikipedia says it's the other way around. That the MRLSs got their nickname from the song.

hot damn that orga is killing

There were various reports that Azov had been holding hostages in the theater before the bombing. These reports also state that they had rigged the building with explosives. The first casuality of war is the truth. We may never know what exactly happened. Even the wiki page cites estimated deaths from 12 - 600, quite a range there.

Here's a report from Max Blumenthal that includes the accounts of civilians that fled via RF humanitarian corridors. They all point to Azov acting as you might expect.

https://www.theburningplatform.com/2022/03/20/was-bombing-of-mariupol-theater-staged-by-ukrainian-azov-extremists-to-trigger-nato-intervention/

I remember VIVIDLY reading this tweet on r/GenZedong, then three days later randomly overhearing on the radio about "Russia's latest crime", bombing a theatre in Mariupol, and I thought THOSE NAZI MOTHERFUCKERS

Maybe play the piano

This is funny, because it is true. But also sad, for exact same reason.

I don’t speak Russian either but I’d love to learn, that’s why I just hum to it and hope one day I can sing along.