Although musicians playing duets might play different instruments and different notes, they do have to synchronize the time in which the tune is performed.
Which, apparently, means they also synchronize brain waves. A study measuring the brain activity of 32 guitarists performing together on a piece showed that their brain waves began to sybchronize as they played. The researcher thinks that people who perform activities in groups will probably all display this tendency, which means it might also show up on sports teams.
Researchers have announced no plans to study the brain patterns of legislators during a session, or of the cast of The Jersey Shore or the audience of the latest horror movie, even though those are all group activities. This makes sense -- they already know that all zeros are, after all, alike.