In the song 25 to life, by Eminem, he is "talking" to hip hop. He feels that his music career isnt worth what its giving him, and what its taken from him he can't ever get back. The 25 years he refers to are the years hes devoted to his career.
Most people think the song is about a lady or Eminem's wife, but it is not. He is singing to hip-hop or the music industry, the lady, and the much he has given to it. He is singing about having given everything to music and still he hasn't got what he deserves.