Crossword Genius

I say there, that was a popular song! (3)

Ross

I believe the answer is:

hey

I'm a little stuck... Click here to teach me more about this clue!

'i say' is the definition.
Both the answer and definition are interjections.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hey that I've seen before include "Exclamation to call attention" , "Exclamation calling attention" , "Call attracting attention" .)

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