Learning to play ensemble music is a great way to develop many basic musical skills, such as rhythm and listening to both yourself and others as you play.
When I was teaching theory classes to young guitar students, I came up with a simple ensemble format for guitar music. In this post, the format provides the notes that are to be played for all four parts of the song God Is So Good.
Each part can be played by one or more students by paying attention to the Roman numeral that tells you on what string to play the notes for that part. Advanced students can try to play more than one part at a time.
Although the music itself is quite simple, working on it with one or more other guitarists can be a fun way to improve your guitar playing!