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).
At the end of the cartoon the cat says: "Well, I can dream, can't I?" Both quotes were used often in Looney Tunes cartoons of this era (like for instance Plane Daffy, Red Hot Riding Hood,...) and are both catch phrases by Jerry Colonna.
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The Hep Cat opens with a cat (who resembles the one from Notes to You) strolling through an abandoned lot.
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