Anyone who has ever played in an orchestra will be familiar with the phenomenon: the impulse for one’s own actions does not seem to come from one’s own mind alone, but rather seems to be controlled by the coordinated activity of the group. And indeed, interbrain networks do emerge when making music together – this has now been demonstrated. Scientists used electrodes to trace the brain waves of guitarists playing in duets. They also observed substantial differences in the musicians’ brain activity, depending upon whether musicians were leading or following their companion.