What a great fall song! You could use this in September/October (paired with Apple Tree and other apple-themed songs). You could also change the type of fruit to meet the season: how about "Christmas Tree" for December, or "cherry tree" for spring? So many choices!
What a great song for 1st graders! It uses exclusively so, mi and la - which is my focus in 1st grade, and is also a great song to use for ta rest. PLUS, it has a cute game that my students really enjoyed.
Now, there is one thing that is slightly confusing about this song if you use it to teach rhythm: If you look at measures 3 and 5, there is a paired eighth note, even though there is only one word underneath. I feel that if this is confusing for your students, you could change it to a ta and use so-so-so. Otherwise, the rhythm is very accessible.
The melody in this song is great for reviewing so, mi, la, or even presenting la. I made a little presentation for this song - you can find it on my Teachers Pay Teachers page here: Wind Up the Apple Tree
Here's a preview: