How does the Classical fortepiano differ from a modern piano?

The Classical fortepiano is characterized by its smaller size and quieter sound compared to the modern piano. It typically has a lighter touch and relies on a wooden frame rather than the iron frame found in contemporary pianos, which contributes to its softer dynamic range. These features make the fortepiano distinct in terms of both construction and sound production, leading to a performance style that emphasizes nuance and delicacy.

The mention of lacking the iron frame is significant because the introduction of the iron frame in modern pianos was a crucial development that allowed for increased tension in the strings, thus enabling a louder playing volume and a broader dynamic range. This structural difference is fundamental in understanding how piano design has evolved over time and how it impacts the overall sound.

Other options don't accurately reflect the specific characteristics of the Classical fortepiano in comparison to modern pianos. For instance, the fortepiano does not have more keys than modern pianos; rather, it usually has a smaller range. Additionally, the modern piano's increased size and loudness are not descriptive of the fortepiano's qualities. The materials used in construction may vary, but the defining difference lies more in the size, frame, and sound dynamics than in the materials alone.