One of my brother's favorite Christmas carols was "The Little Drummer Boy." I recall as children in our Sunday school Christmas recital, him and his buddy fought over who was going to play the Drummer Boy. Both wanted to "pa, rum, pa-pa-pum" on the little drum and to appease both exuberant drummers, they ended with two Drummer Boys who learned to take turns.
Originally titled "Carol of the Drum," written and composed by Katherine Kennicott Davis, a music teacher at Wellesley College in Massachusetts in 1941. Davis composed the song based on an old Czech carol; however, the original carol has not been uncovered. The song was first recorded by the Trapp Family Singers (yes, the very family depicted in the Sound of Music) and made popular by Harry Simeone.
Since Simeone the song has graced the talented vocals of such singers as Bing Crosby, Johnny Mathis, Whitney Houston, and Mariah Carey (to name a few). It appears everyone has learned to take turns with this one.
Most recently the Pentatonix released a video of their version of the song.