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Does anyone know the name to this classical song that goes "du dudu duuuu duuuu" (eight note, two sixteenth notes, two quarter notes).

https://onlinesequencer.net/1290079

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You probably mean "Ride of the Valkyries" which is the beginning of act 3 of Richard Wagner's opera "Die Walküre" (the second of the four operas in his cycle "Der Ring des Nibelungen").

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For completeness, there are probably countless pieces starting with that rhythm.  The one that sprang to my mind is the Gayment from Telemann's Fantaisie pour clavessin #10, TWV 33:22 (which you can see here and hear here).

(The Wagner is probably by far the best-known, of course.  But Telemann beat him to it by over a century :)

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