What else do you need to define teamwork?
Chemistry may be another element. All kinds of people may be able to go through the motions of something perfectly. but sometimes magic happens in the casting. In a rock band, it may be the difference between the session musician and the bond between the band members. In an orchestra or choir, it could be a familiarity with your regular colleagues and conductor's ways of doing things. In acting, certain people just feed off each other really well, bringing things to life. In some memorable TV shows, for example, it seems that everyone was cast perfectly from the biggest stars to the smallest roles. You just can't imagine anyone else in any of those roles. In the world of ballet you do get to see different people playing the same role, like different orchestras performing the same symphony. I suppose in sports some famous line-ups and pairings may have been able to read each other's moves, signals and thoughts really well.