Final answer:
The galloping music in question is likely to be 'Allegro' and 'Staccato,' each describing fast, lively, and detached notes, like hoofbeats. 'Legato' does not describe galloping since it conveys smoothness, and 'Crescendo' is about volume increase, not tempo or articulation.
Step-by-step explanation:
The galloping music played by the pianist at the beginning of a song might be described using various musical terms. However, not all of the options provided would necessarily apply to galloping music. Allegro, which means fast and lively, could indeed describe the brisk tempo often associated with a galloping rhythm. Staccato, indicating detached or disconnected notes, could characterize the short, sharp sounds that mimic the hoofbeats of a gallop. On the other hand, Legato, which means smooth and connected, is not typically associated with a galloping rhythm, as it implies a flow without the sharp articulation of staccato. Lastly, Crescendo, meaning gradually getting louder, does not specifically describe the tempo or articulation of a piece, but rather the dynamic level, and so it might not directly relate to the concept of 'galloping' unless the music notably increases in volume.