//reimplement download to insert info into id3 tags
func (dm *DownloadableMusic) Do() (resp curl.Response, err error) {
	resp, err = dm.DownloadableFile.Do()
	if err != nil {
		return
	}
	mp3file, err := id3.Open(dm.ActualPath())
	defer mp3file.Close()
	//add id3 info
	mp3file.SetTitle(dm.Title)
	mp3file.SetArtist(dm.Artist)
	if dm.Album != "" {
		mp3file.SetAlbum(dm.Album)
	}
	if dm.Genre != "" {
		mp3file.SetGenre(dm.Genre)
	}
	//download and insert lyrics
	if dm.LyricsId != 0 {
		rac := requestwrapper.RequestAccesser{Token: dm.AccessToken}
		parms := map[string]string{"lyrics_id": strconv.FormatFloat(dm.LyricsId, 'f', -1, 64)}
		vkresp, err := rac.MakeRequest("audio.getLyrics", parms)
		if err != nil {
			return resp, err
		}
		lyrics := vkresp["response"].(map[string]interface{})["text"].(string)
		frt := v2.V23FrameTypeMap["USLT"]
		lyricsFrame := v2.NewTextFrame(frt, lyrics)
		mp3file.AddFrames(lyricsFrame)
	}
	return
}
func setFrame(tag *id3.File, frameName string, value string) bool {
	frame := tag.Frame(frameName)
	if frame != nil {
		//		fmt.Println("changing frame")
		if textFramer, ok := frame.(v2.TextFramer); ok {
			textFramer.SetEncoding("UTF-8")
			textFramer.SetText(value)
			return true
		}
	} else {
		//		fmt.Println("adding frame")
		ft := v2.V23FrameTypeMap[frameName]
		textFrame := v2.NewTextFrame(ft, "")
		textFrame.SetEncoding("UTF-8")
		textFrame.SetText(value)
		tag.AddFrames(textFrame)
	}
	return false
}