In my dissertation, I theorize that we can find the components of language by looking at ape behaviors. Further, I argue that language is rooted in song. While I did argue that language emerged out of a division of song into music and language, which, as it turns out, is probably technically wrong. I was nevertheless on the right track.
Language is likely a combination of music/song and communicative sounds/gestures. Thus, I was right that language is related to ape mating songs (as we see in gibbons) and that it's not unconnnected to ape communication. My mixing and matching and divisions, though, were somewhat off. Better than being completely wrong in my language theory, though!