It seems there's a bit of confusion in your statement regarding Franz Schubert. Here's a breakdown of the points mentioned:
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Whole-tone scale: Schubert did not primarily write melodies based on the whole-tone scale. Whole-tone scales were more prominent in the works of later composers, such as Claude Debussy.
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Piano trio: While Schubert made significant contributions to chamber music, including piano trios, he did not create the genre; the piano trio existed before his time. However, his works in this genre are highly regarded and certainly advanced the form.
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Atonal music: Schubert was not a pioneer of atonal music. Atonality became prominent in the 20th century, primarily through the works of composers like Arnold Schoenberg. Schubert's music is firmly rooted in the tonal system.
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Tonal conventions of sonata form: Schubert did innovate within the sonata form and often explored unconventional harmonic relationships, but his contributions were more about emotional depth and lyrical melodies than combining unrelated keys in a groundbreaking way.
Overall, Schubert was ahead of his time in his rich harmonic language, lyrical melodies, and the emotional depth of his music, which paved the way for later Romantic composers. However, the specific claims about the whole-tone scale, a new genre of piano trio, atonality, or unconventional keys are not accurate representations of his innovations.