Listen to Be Prepared online. Be Prepared is an English language song and is sung by Tom Lehrer. Be Prepared, from the album The Very Best of Tom Lehrer, Victor Borge and Flanders and Swann. The Kings of Comedy: 3 Hours of Non-Stop Laughter from the 50's, was released in the year 2012. The duration of the song is 1:33. Download English songs online from JioSaavn.