Final answer:
The question seeks to identify which excerpt from Handel's music is played by a solo instrument, but without audio, a precise answer is not possible.
Step-by-step explanation:
The question appears to be asking which of the excerpts from G. F. Handel's See Here the Conqu'ring Hero Comes is played by a solo instrument. However, without the actual audio excerpts, it's impossible to provide an accurate answer regarding which one is played solo. The provided text references a variety of musical scenarios and elements, including a slow march, a violoncello, a key'd cornet, and dramatic orchestral music in films, yet none of these excerpts explicitly state which one is tied to Handel's piece played by a solo instrument.