Diabelli is associated with which musical period?

Diabelli is associated with the Classical period, which is significant for several reasons. First, he was a prominent composer and publisher during this time, known for his work in early 19th-century Vienna. The Classical period is characterized by clarity of structure, balance, and adherence to forms such as sonatas and symphonies, which were hallmark traits of composers like Haydn, Mozart, and Beethoven—figures who influenced and were contemporaries of Diabelli.

Additionally, one of Diabelli's most well-known contributions to music is the "Sonatina in C Major," and he is perhaps best remembered for his variations on a waltz that Beethoven expanded upon in his famous set of "Diabelli Variations." This interaction further solidifies Diabelli's place within the Classical period, highlighting the stylistic and compositional practices that were prevalent at the time.

The other musical periods listed—Baroque, Romantic, and Modern—each have distinct characteristics and representative composers that do not align as closely with Diabelli’s work and contributions as the Classical period does. Therefore, the association of Diabelli with the Classical period is accurate and well-founded in the context of music history.