Final answer:
The student is inquiring about changes in sections within the Colonel Bogey March, focusing on music analysis which involves recognizing differences in melody, instrumentation, and tempo.
Step-by-step explanation:
The student's question pertains to specific sections within the Colonel Bogey March, which is a piece of music. When identifying changes in sections of a musical piece, listeners often refer to changes in melody, tempo, instrumentation or a notable transition in the musical narrative.
At 0:00-1:54, this is likely the opening section or introduction of the march, during which themes are established and the character of the march is introduced. Then, a section change at 2:50 might indicate a transition to a contrasting theme or a new movement in the piece. The period between 2:50-4:49 can be a continued development of this contrasting material or possibly a reprise of the main theme.
To analyze such changes, someone would listen for variations in melodies, changes in the dynamics, and shifts in rhythm or tempo that signify a new section has begun. The excerpts from the poem provided hint at mood and instrumentation that one might listen for in the march, such as the sorrowful tone indicated by the flag-tops draped in muslin, and the inclusion of specific instruments like the violoncello and the cornet.