And always sing it when at leisure, Drinking English bitter by the measure, And ensure that it is all in tune, Neither sharp nor flat let be your unisoon, And if you play upon the tin whistle Get one in the right key, or your tin whistle Playing might attract a missile. The timimg too is must be kept As singers and players must not get out of step Or the end of the song will come at different times For each performer, which might spoil the rhymes.