I remember once a piece composed by someone from the classical period sounded remarkably similar to "The Happiest Christmas Tree". Anyone know what I'm describing?

Thanks!
(Incidentally, there is a passage in the Toccata of Bach's Partitia no. 6 in E minor that sounds like "Dark Eyes", and a part of "Our Love is Here to Stay" resembles a measure of Chopin's "Tristesse"

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