Is Franz Lehar a classical composer?

or Johann Strauss, or Jacques Offenbach, or Sigmund Romberg? Where do you draw the line?
Update: I keep coming back to ganzes Herz. Classic or camp? Does it matter? It makes the hair on my arms stand up. The reaction of the little girl at 1:00 is priceless.

https://www.youtube.com/watch?v=Pa58TdbR...

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