Here is a video of an excellent performance of this piece by Renee Fleming and the Sydney Children's Choir. This is a canon for 3 voices. Each player will learn the same material which will overlap in a cycle. Level 8 students begin to learn new notes. In fifth position we add the first-string notes A, B and C. We specify which position to play in with a roman numeral. In this case the notes are in fifth position (V). It’s extremely helpful to demonstrate how notes encountered in first position can be played in upper positions. You should explain that most notes on the first string of the guitar can also be played on the second string 5 frets higher. The attached sequence document contains an elaboration of this concept including examples.