A cool melody that many people will recognize! You can play the top line on sax as shown in this video. Piano would play a harmony as well for this melody.

Only three notes, so get the notes, then focus on the rhythm.

If you would like to learn more of the song, here’s the sheet music for first alto sax from an arrangement

I had been learning to draw Snoopy as well, so I threw some of my sketches into the video. Those were done tracing, copying, and by memory. Spent a bit of time on it.