The phrase "a dozen instruments" is correct and usable in written English.
It can be used when referring to a quantity of twelve instruments, often in contexts related to music, tools, or equipment.
Example: "The orchestra was equipped with a dozen instruments, ranging from violins to trumpets."
Alternatives: "twelve instruments" or "a dozen tools".
His own brass band consisted of nine to a dozen instruments, sometimes including three trumpets.
He plays more than a dozen instruments — piano, guitar, saxophone, bass guitar, drums… the list goes on, but his favorites are piano and sax, for now.
From there down to the sea floor, more than a dozen instruments will track currents, salinity, temperature, and other conditions at various depths.
"And I'm going to fix up the space under the porch to be a shotgun music studio," said Mr. Graziano, who writes music, plays half a dozen instruments and is in two bands, Snowwhat and the Worthy Few.
And if the home of a professional saxophonist often resembles a small-town music shop of decades past, with perhaps a dozen instruments, Frank Catalano's home is more like a saxophone Wal-Mart.
The Carpenters took a small commission on the deal; the hedge-fund manager has gone on to buy more than half a dozen instruments from them, and has made introductions to other potential buyers.
A ukulele-like jarana hangs with more than a dozen string instruments in the packed music room.
The versatility of the musicians was impressive; some took up half a dozen different instruments in the course of the concert.
The music teacher at Lake Avenue Elementary School stood in front of the class with a dozen stringed instruments lined up at the front of the room.
Terence was a big man, who lived in a big way — he spoke seven languages, played more than a dozen musical instruments.
The project, known as RiverNet, is to use roughly two dozen instruments in all.
