A simple, friendly question, is the song Plastic Fantastic Lover a rap song? If not, why not? https://www.youtube.com/watch?v=kGE6YWVao0Y"]Jefferson Airplane -1969- Plastic Fantastic Lover - YouTube
Usually rap lyrics are not "sung" to a melody. Balin is singing, not speaking. Also I don't believe the beats of the instruments align with the beats of the lyrics. Every fourth beat should align, if I understand Rap correctly, and I probably don't. Now listen to Eric Burdon's 1968 "Year of the Guru" to hear the difference: https://www.youtube.com/watch?v=z7lASc4EqOg"]"Year Of The Guru" Eric Burdon & The Animals 1968 - YouTube
So rap is not just "rhythmic spoken word over music". There are metrical limitations in addition to that definition?