Does "song as old as tune" deliver the same meaning?
No, unfortunately, it doesn't. "Song as old as tune" sounds a little weird in English. You would need to add an article, such as "the" before both "tune" and "song" for the sentence to sound natural and make sense. As for the meaning, I am unsure if it really changes the meaning of the sentence, but if you say this phrase, you will be corrected. This is because of the popularity of this song and how well people know it. They may think that you just said it incorrectly.
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