The modern musical Seussical by Flaherty and Ahrens also has several songs written in these extreme keys.
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The end of the exposition of the second movement Charles-Valentin Alkan's Grande sonate 'Les quatre âges', subtitled Quasi-Faust, is in G-sharp major, although written with a six-sharp key signature (the movement opens in D-sharp minor and ends in F-sharp major).