The Constitution regulates the things that people are allowed to say. There are clauses in the Constitution that deal with these things. The problem with music is that there is Slander, where the artist is defaming a person's reputation. If things like Slander and Libel are regulated with everything else then why wouldn't music be regulated? All other forms of art such as poetry, and books are monitored and regulated for content purposes, therefore as another art form music should be too.
Also Music leaves a much bigger impression on the youth with their catchy lyrics and hypnotic hooks, a musician could hold more power and influence over the youth then, literary figures like Emerson and Throe. Music should be regulated and restricted to protect the youth of our society.
The impression that the music leaves on the youth could be as well as a problem due to music as it would if they started becoming more violent because they started playing Call of Duty or Halo. there is nothing you can do about the impression of our youth, and the popular demand for these forms of art like music and video games suggest that you cannot take these away or limit them. but you are right in the way of if the artist is attacking another person's reputation in a way that the victim doesn't want, then you should limit that because that could be an indirect form of bullying or verbal assault.
Video games are regulated. They have all different kinds of rating and warning where people know what they are buying. With music there can be subtle references to sex and drugs all the time. A good reference to this would be Katy Perry's teenage dream album not having an explicit rating,. Even singing a song about seeing a guys. "Peacock"
Exactly, ratings. You can put an explicit sign on an album if it contains offensive and suggestive language so the buyers can be warned. But you cannot limit or eliminate the use of those words entirely. The only thing you can do to prevent a small child from being affected by these word choices, is put a warning on the cover of the album so the parents will know that these song choices may not be appropriate for their little one's ears.