Beethoven, especially the "opuses" (ugly plural, should be "opera") no 1, no 70, no 97 (the piano trios), no 24 (violin sonata) and part of no 125 (Symphony no 9).
Welcome! I hope you'll have fun here. Thanks for your contributions in algebra! --AxelBoldt
Welcome to Wikipedia, Daniele! Grand to see another mathematician. --LMS
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... is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different cases:
If the discriminant is zero, then there is a ...