This is our first time hearing the song, so we don't know if that buzzing noise is a part of the song or if it is coming from an off-screen device.
Regardless, this is apparently the Dutch girl band ADAM. They're singing a song while they all achieve an orgasm. At least that's what it looks like.
"Komt Zingend Klaar" translates to "Singing is Done."
This might technically be safe for work. But, use your best judgement.