Need You Now, Voice Band edition
(download)
Okay after a bunch of tries recording this, I've concluded that I'm not made to voice the "bom pah" as accurately as the Voice Band app requires. The app developers make it look way too easy on YouTube.
All the same, here's Need You Now by Lady Antebellum. I used an acoustic guitar for the backing, with everything else you hear (drums, bass, distorted electric guitar in the chorus) powered by my voice. BAH BAH BAH.