I've been recruited to play with a guitarist for a Christmas event at a church. One of the songs is 'Joy to the World'. I just happen to have a book where this song is displayed in tab (on the G string: 7 6 4 2 etc...) but the sheet music the guitarist has is completely different. We tried playing them both together and agreed that both parts are in a different key. Neither I or the guitarist are very good at reading sheet music. Can anyone offer any insight about this particular song?