I haven't listened to the whole album, but I iTunes'd this track out of curiosity and have to second James' (and evil twin Joseph's) question. It does start off with some "sounds like actual drums" VP all by its lonesome in the intro, but as soon as the voices come in, I think it's pretty clear that they are voices.
Unless Elie was referring to the drum intro. Which, granted, doesn't sound like a girl beatboxing, but also isn't anything egregious when compared to the majority of contemporary a cappella.
MattRyd.com | Fun, catchy music. With an extra dash of Awesome.
Alum of Northwestern University's Purple Haze (2007)