The Worry Tree mp3 guided (female voice) self help visualisation is 28  minutes 50 seconds long, with original relaxing background music.  This mp3 will help you to notice the worrying thoughts, and to deal with them differently - instead of worrying.  Good for those who spend too much time worrying e.g. Generalised Anxiety Disorder.  

The MP3 recordings will be most effective when used at least daily.  While they will help you feel more relaxed and positive immediately, the best effects will be seen with repeated use over a longer period.