Someone just asked me in chat what a missed note in music is called. Without hesitation, I replied, "A clam." It's what I've always heard in academic and professional settings since forever.
Only now, having to explain its usage and origin, I went looking and found only informal origins and folk-etymology explanations. One such was the notion that it is derived from the expression "to clam up," meaning to fall silent (see Etymonline, which attests it as American from 1916 while noting that the word clam itself has been used as an interjection meaning ‘clam up’ since the 14th century). But there are problems with that. For one thing, a "clam" note is one that is played instead of the actually written or appropriate note. In other words, it sounds … something that is the opposite of silence.
Here's another attempt at explaining the origin:
The origin of using the word "clam" to describe a missed note is rooted in
the theatre TTBOMK. As I understand it, actors would describe an untimely
entrance or forgotten line as "making a clam." Certainly, if that was the
case, horn players in the pit would have readily taken up the use of the
word and spread it around the musical community.
The "TTBOMK" gives it away as folk etymology, and the argument that follows is what I will charitably call less than rigorous.
Still, it does demonstrate that I'm not the only one who's ever heard the term. And really, almost everywhere I've ever played music the term has come up (though not about my playing—honest!). It's also not the only term used for a missed note (one I especially loved was "approximatura," which played nicely off the musical term appogiatura, but that's a story for another day).
And The Word Detective says:
The likening of a closed mouth, or the human mouth in general, to the bivalve sort of “clam” may underlie the use of “clam” to mean a missed or flubbed note, especially if the term originated in connection with wind instruments. This usage dates back to at least the early 1950s and since then has been applied to an error in any sort of musical or theatrical performance (“Bing Crosby … always said, ‘Leave the clams in, let ’em know I’m human,'” New York Times, 1991). Perhaps the “error” sense of the term lies in the failure of one’s “clam,” or mouth, to perform correctly.
… which is anything but definitive. Other possibilities listed in the piece are softened by statements like "it seems entirely logical that …"
So can anybody provide an actual origin story for use of this term in this context?
Best Answer
The earliest coverage of clam in the sense of "mistake or misplayed musical note" that I've been able to find is in Harold Wentwoth & Stuart Flexner, Dictionary of American Slang, first edition (1960):
J.E. Lighter, Random House Historical Dictionary of American Slang (1994) cites the 1952 instance reported in Wentworth & Flexner as its first recorded occurrence of the usage, but then adds a slightly later occurrence, from 1955, and still later ones from 1964 and 1991:
Robert Chapman & Barbara Kipfer, Dictionary of American Slang, third edition (1995) reports that the expression goes back to the 1940s but does not cite any historical examples:
Coincidentally (or not), Chapman & Kipfer also notes that clambake had a special meaning in jazz circles, starting in the 1930s:
So if clam originated as a jazz term in the 1940s, rather than more broadly as an U.S. entertainment industry term by the early 1950s, a clam (wrong note) may have referred to the sort of mistake that a jazz musician would expect to encounter more frequently at a clambake (jam session) than at a formal, paying performance.
Clarence Major, Juba to Jive: A Dictionary of African-American Slang (1994) lends some support to this theory in its entries for clam and clambake, both of which cite entries that originated in Robert Gold, A Jazz Lexicon (1964):
And H. Brook Webb, "The Slang of Jazz," in American Speech (1937) confirms that clambake was used to refer to a jam session in the 1930s [combined snippets]:
I'm not entirely sold on the clam-by-way-of-clambake explanation, in part because it doesn't persuasively indicate why a word chosen presumably for its pleasant associations with relaxed good times (clambake) should have yielded a derogatory term for faulty musicianship (clam), and in part because it isn't clear to me that clam originated as jazz talk rather than in the wider world of U.S. entertainment.
Nevertheless, I think that 1930–1952 is very likely the approximate origin period for both clambake and clam in the relevant senses. And any better explanation of the origin of clam as "mistake" should devote at least a little time to explaining why the jazz terms clam and clambake are not related.
Update (May 21, 2021):
After posting this answer, I bought a copy of Robert Gold, A Jazz Lexicon (1964), which (as noted in my original answer) Clarence Major cites in his entries for clam and clambake. Gold's entries for the two terms are quite a bit more detailed than Majors's and are worthy of reproduction at full length:
Gold's discussion and cited quotations make a strong circumstantial case for clam to have emerged from the pejorative sense of clambake—a sense that I was not aware of when I wrote my original answer. The timing is certainly right for such an origin, since clambake had evidently acquired negative connotations at least as early as Cab Calloway's Hi De Ho glossary, which was published in 1938, and the paper trail for clam in the relevant sense begins about a dozen years later.