add (Xmms::Remote)

    /*
     * Add one or more songs to the playlist.
     *
     * This method raises an Xmms::Error exception if XMMS is not running,
     * an ArgumentError exception if the number of arguments is less than 1,
     * or a TypeError exception if the argument isn't a String, True, or
     * False.
     *
     * Examples:
     *   # replace the current playlist with one song
     *   enqueue = false
     *   remote.add 'path/to/cool_song.mp3', enqueue
     *
     *   # add several files to the current playlist
     *   files = %w{song01.mp3 song02.mp3 song03.mp3 song04.mp3 song05.mp3}
     *   remote.add *files
     *
     */
    static VALUE xr_pl_add(int argc, VALUE *argv, VALUE self) {