I've been a muscian for over 20 years (a viola player for all20 of those years) and the one thing I remember that was the hardest to learn was how to play together as a group (in other words not everyone playing the exact same notes). I have recently begun arranging popular songs for different instruments and I know that this is a song that can very easily be learned by intermediate to advanced elementary musicians. I also enjoy taking a song and listen to the tone of the vocal part..so when I arrange the melody isn't always the violins(it's the viola in this case). I do play through the parts to makesure it all sounds good. I say intermediate to advanced because there are some eighth notes scattered in the piece..but beginning students could perform this at the end of the year easily.
4 pages (1 page per instrument)