Come And Get It was the theme song for the 1969 movie The Magic Christian, starring Peter Sellers and Ringo Starr. Paul McCartney wrote the song and gave it to the Badfinger to record, promising it would be a hit if they did it exactly like his demo. They did, and it was. It was originally done on piano but it translates very well to the guitar using a strumming pattern that mimics the piano accompaniment. The lesson is done in the key of E and requires a couple of slightly difficult chords, B and Fmaj7.