Mlsstl, I truly don't understand the relevance of your historical examples in this discussion. About this, and your use of the dictionary as a reference, we will have to agree to disagree. But, I find this comment particularly interesting:
****There are plenty of well regarded critics who will explain to those who wish to listen just how progressive and important rap music is****
Since when do music critics determine which music will be "important" in music history? There are many examples in history of works, now considered masterpieces, that were panned by "well regarded critics" when premiered. I do agree with the critics that rap is progressive and important; but, that still doesn't make it good music. Its importance is not defined by it's inherent quality (or lack thereof) as an art form.