Getting mp3 links from music site

music.clj

(def song-url "http://www.mzhiphop.com/song-17803-Usher---Paradise")
(def song-static "http://www.sharebeast.com/mp3embed-")
(defn get-download-url [url]
  (str song-static
       (second
        (str/split (second
                    (str/split
                     (get-in  (nth
                               (html/select
                                (html/html-resource
                                 (html/html-snippet
                                  (:body (http/get url))))
                                [:iframe]) 2) [:attrs :src]) #"&")) #"=")) ".mp3"))