"Por una cabeza" is all over the place these days. It's happened fairly often. A piece of music is heard in a popular movie, gets picked up and used in later movies, finds its way to television, and winds up behind commercials for toothpaste and male enhancement products. Maybe the ultimate in humiliation is having the piece played as supermarket musak, along with the Monkee's "I'm a Believer" and string arrangements of "It's a Long Day's Night."
It happened, for instance, with Pachelbel's "Canon" (beginning with "Ordinary People"), the aria "Nessun Dorma" ("The Killing Fields"), and now this. The choral movement from Beethoven's Ninth has been subject to this mutilation for years. (See "Die Hard.")
In sociology, this kind of thing is called "collective behavior" and is allied to crazes, fads, urban legends, rumors, and manias like pet rocks, the hula hoop, the phantom gasser of Matoon, Paul McCartney is dead, worms in the McDonald's hamburgers, pre-school porno rings, J. Edgar Hoover as a cross-dresser, and Barack Obama's non-citizenship.
Sociologists have given it a decent amount of attention but nobody's pinned down its causes or predicted the paths of development. Sometimes an idea or a thing, like "Por Una Cabeza", takes off. Sometimes, like the ubiquity of internet predators, it doesn't. Nobody knows why.
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