Who is the composer of the Piano Sonata in C Minor, Op. 13?

The Piano Sonata in C Minor, Op. 13 is commonly known as Beethoven's "Pathétique" Sonata. This piece is one of Beethoven's most celebrated works, composed in 1798, and is noted for its emotional depth and innovative structure, which includes dramatic contrasts between the lyrical second movement and the intense opening and closing movements. The somber yet passionate character of the piece is a hallmark of Beethoven's early style, displaying his ability to convey profound emotion through music.

In contrast, the other composers listed are not associated with this specific sonata. Mozart, while a contemporary of Beethoven, is known for different compositions and styles that differ from the thematic and structural elements of the "Pathétique." Claude Frank is a more recent pianist and composer, and George Szell was primarily a conductor and does not have a direct connection to composing the "Pathétique." Therefore, recognizing Beethoven as the composer of this specific piano sonata situates it within his larger body of work, demonstrating his influence on the evolution of piano music.