def has_mp3_preview(track_URI, spotify):
    """Function to return whether the requested track has an mp3 preview available.

    Args:
        track_URI (str): Track URI for searching Spotify
        spotify (Spotify): Spotify instance to query

    Returns:
        (bool): Boolean whose value indicates whether an mp3 preview is
                available for the track on Spotify
    """
    return spotify.track(track_URI)['preview_url'] is not None