If you could express the beauty of autumn through music, surely it would be in a song like this. Gentle, lovely, and peaceful, it has a flowing ease about it that might just make you want to pause and notice the world around you.
To keep it simple and more attainable by younger students, use it as a unison piece. The optional part 2 makes for a nice duet to use with your older students. Rehearsal tracks for both parts are included with the kit. (from Music K-8, Vol. 24, No. 1)