This tune has great things to teach musically: chromatics (sharps and flats, the fact that these accidentals stay in effect until the end of the bar they occur in), interesting rhythm, and fantastic underlying chord progressions (advanced). Besides, every kid on the planet wants to learn this song, so you’re gonna see great enthusiasm on the practice side.

Here’s my take on it in Dm with piano fingerings:

the-avengers-score-teacher2-dm-asilvestri

and corresponding banjo-ukulele backup and melody track:

And here it is in Em:

the-avengers-score-teacher2-em-asilvestri

and corresponding banjo-ukulele backup and melody track (courtesy of the Amazing Slow Downer):

Bonus: I learned how cool this tune sounds on banjo ukulele. Who knew?