We asked them to focus on the mood, tempo, dynamics, rhythm, pitch, tonality, instrumentation, and anything else that they could think of. Of course, some students may interpret the two pieces differently, and that's okay! However, some qualities (such as instrumentation and tonality), are concrete and not open for interpretation.
Once they completed the listening activity on their own, we collaborated and made a big diagram on the board. Here is the diagram for Mrs. Kip and Mrs. Gerry's classes: