While the first movement of Beethoven’s Fifth Symphony receives all the glory (trite notoriety?), may I suggest the second through fourth movements? The entire symphony should be listened to as a whole, if possible. If not, listen to the parts-break it down for young listeners-describe the theme that runs through the entire symphony, listen for the way distinct instruments are introduced, each falling back on the central theme; describe the goosebumps when the transition from third to fourth movements occurs.
Great post. The second movement is sublime. I also like Gould’s version of Liszt transcription of that movement. I listen to—and play—that much more than the other movements. The orchestral version is probably the only one for children, however (to remain on topic).