I was unfamiliar with the original song (Taio Cruz's "Dynamite") or Mike Tompkins' a cappella version, so the catchy tune was new to me. So far, it hasn't gotten old. It's downright addictive.
A large part of the appeal is that these are cute, young Jewish boys with yarmulkes (and often glasses). My basic type: never mind that I'm not religious, and old enough to be their mother (or practically grandmother). I'm not alone; multiple YouTube comments are in this vein, similarly this blogger and some frum moms.
There's also a behind-the-scenes video and an earlier effort, "One Day."
Media attention builds. Former co-worker J.R. produced this interview, and the guys sang this morning on CBS.
(Dear Level 42: Don't worry, I'll soon be back to obsessing over you and playing your videos, after this Chanukah break.)