There's a few different ways to reply to this post, most lethngy but I'll try to make a few points and be brief at the same time. So, does that imply that Hip Hop has an incredibly short lifespan? The short answer? Yes. BUT it's more complicated than that. On the surface, Hip Hop (used strictly as a genre of music here, not the broader subject of Hip Hop culture) does have a very short life span. Radio and the various music tv channels play a song/video when it's new, maybe a 2 to 4 month span. After that it will sit in a purgatory of sorts until it can reach a designation of old school , then it could be appropriately brought back on the various Old School Lunch Hour programs on our urban radio stations. How long until a song is considered old school depends on the overall popularity of a song, the more popular a song is, the faster it seems to become old school and acceptable to play as a throwback . does Hip Hop have their own comparative to The Beatles? I guess, begrudgingly, we could call Jay-Z The Beatles of Hip Hop in that his music is most universally accepted by the various subcultures of Hip Hop, he's had the most commercial success (with Eminem basically neck in neck), and with his music seeming to achieve that throwback/old school acceptance almost instantly as it's acceptable to play any song from his discography at any time garnering him almost constant airplay. Do I think in 40 years that radio will still play Jay-Z music? Yes, I do. Is this a timeless form of music, which deserves the deepest care and preservation, or a dying star and the epoch of bygone era? Definitely a timeless form of music, as should be all music. Every genre of music has evolved greatly. The rock of today sounds nothing like Little Richie. Should it? Of course not. Since music was created, I dare to say that no genre has ever been created. It's all evolved from a previous form of music. The process continues and will do so as long as there are people to make it. It's up to us to go back and remind ourselves of the the roots we came from, all the while blazing new trails musically. Why does there exist eighteen principles outlined in The HipHop Declaration of Peace? Now, that's moving from a musical question to a cultural one and to answer that I need to expound on the mindset and culture from where Hip Hop has risen.Think urban desolation for a moment. Let your mind sit there. Think of the inner city and the mindset of it. I am nothing unless I'm the baddest, toughest, most ruthless person on my block. If I don't seem strong and dangerous, I will be taken advantage of, robbed or killed. The government doesn't care what happens to me and my family, There isn't a job in miles to be found so what can I do? Sell drugs, protect myself, and find a way to live like a king, all on my own terms. I'm not saying that is the truth of the matter, but that's the prevalent mentality. So how do we escape this cycle of drugs, sex and violence? We make music about the drugs, sex and violence. And in a culture that either glorifies or accepts this lifestyle, we must live the way we portray ourselves in this music. Hence you find something such as the eighteen principles, trying to counteract this mindset.Like I've already mentioned most terrestrial radio has an old school hour of some sort to find those artists mentioned, but also on digital radio, satellite and online radio you can find whole stations dedicated to old school.