We already knew Fall Out Boy [1] singer Patrick Stump had one hell of a voice, but after watching a recent video posted to Stump's YouTube account, we discovered that his pipes are not just great for pop-punk -- but Top 40 pop as well.

Video: Patrick Stump Goes A Cappella

In the clip, Stump performs stunning a cappella versions of five mega-hits, weaving the songs seamlessly into one another: "Empire State Of Mind" by Jay-Z [2] and Alicia Keys [3], "Love the Way You Lie" by Eminem [4] feat. Rihanna [5], "Need You Now" by Lady Antebellum [6], "Nothin' On You" by B.o.B [7] feat. Bruno Mars [8], and "F**k You" by Cee Lo Green [9]. And back again!

It's not just that he belts out the songs straight into the camera -- his own vocal harmonies and beatboxing are dubbed into the mix as well.

We're not explicitly saying Stump sings Rihanna's part on "Love the Way You Lie" better than the Barbadian beauty, but...