As Porky feels guilt over the cat's death, he's startled to hear the cat's nine lives outside his window singing the Sextet from the opera Lucia di Lammermoor.
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Porky locks down the window, but the cat reopens the door and sings Jeepers Creepers.
The Hep Cat opens with a cat (who resembles the one from Notes to You) strolling through an abandoned lot.
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It has a similar plot (although the ending of the original doesn't have the characters die from an explosion; instead the cat dies from getting shot, and returns as nine singing angels), but the Elmer and Sylvester characters in Notes to You were taken by Porky Pig and an unnamed alley cat (the latter bearing a striking resemblance to the cat from Bob Clampett's The Hep Cat).