Listen to Pat-A-Pan/While Shepherds Watched Their Flocks By Night (Medley) (2006 Digital Remaster) online. Pat-A-Pan/While Shepherds Watched Their Flocks By Night (Medley) (2006 Digital Remaster) is an English language song and is sung by Bing Crosby. Pat-A-Pan/While Shepherds Watched Their Flocks By Night (Medley) (2006 Digital Remaster), from the album Bing Crosby - Christmas Classics, was released in the year 2013. The duration of the song is 2:50. Download English songs online from JioSaavn.