What, they played it more than once?
Oh, "it" was only played once, and as I suspected (confirmed when I approached them after Mincha suggesting that they share the wealth and take the bus elsewhere) was due to the non-Jewish operator of the bus not knowing what it is, and just looking up "Jewish" music, and that came up as a track.
But the constant noise outside my window is still there (though they said they would lower it a bit). I guess there's a price to pay when you're centrally located.