Prose in Music

Ever since beginning the discussion of whether Bob Dylan's music can be classified as "poetry," I have been wrestling with another idea in my mind. It has become more common in pop music videos for artists to have some sort of spoken yet artistic "prologue" before their songs begin in their videos. My favorite example that I can think of at the moment is Lana Del Rey's introduction to her music video, "Ride," and another example that I give hesitantly is Rhianna's introduction to her single "We Found Love." These are not part of their recorded songs, however, I have been wondering if these beautifully crafted introductions could be classified as music, or literature? Maybe the beauty in this lies in my confusion of what to call them, and their capabilities to serve as both?