Watson also provided the voice for Prince Chawmin' in the infamous Censored Eleven cartoon Coal Black and de Sebben Dwarfs (directed by Bob Clampett, 1943).
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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).
The word foo became very popular in the 1930s, and also appeared in other cartoons including the Looney Tunes cartoons of Bob Clampett such as The Daffy Doc and Porky in Wackyland (both 1938, with Daffy Duck and Porky Pig), and in other comic strips such as Pogo.
The cartoon's story (which is essentially a re-working of Bob Clampett's 1941 short Porky's Pooch) is about a dog named Rags McMutt, who has just escaped from the dog pound and accidentally meets Charlie, an old friend of his in a car he used as a hiding place.
He moved over to Bob Clampett's unit in 1938 where he animated and/or co-directed several classic black and white Looney Tunes.