Why might you see the drummer hit the drum before you actually hear the drums sound if you sit in the last row of an auditorium during a band concert?

The delay between seeing the drummer hit the drum and hearing the sound is due to the speed of light being faster than the speed of sound. Light from the drummer reaches your eyes almost instantly, while sound travels more slowly through the air. Consequently, if you're sitting far away in the last row, the sound takes longer to reach you, resulting in a noticeable lag. This phenomenon is an example of the difference in propagation speeds of light and sound.