Please, listen carefully to this song -or both of them- (it's in a foreign language, so you won't understand what they're saying ... buuut that's not the point), and read question below.

Here
aaaand another one:
Here

Now, can you believe it (the entire piece) is made without a single instrument? They used only their voices (what sounds like music accompaniment is not, just other voices). What amazing vocal control

~lily

Wow! These are pretty incredible!