One of the cool features in iTunes is that you can tell it to start any song any given amount of time after the actual beginning and/or to stop it before the end.
To do this, simply Control-Click a song and select “Get Info” or press Command-I after highlighting the song. Then, select the “Options” pane and enter your new start and end times in the appropriate boxes. Make sure that the appropriate check boxes are checked, otherwise the new times will not take effect.
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Phil