henry copeland:

Miles Davis is not Mozart: The brains of jazz and classical pianists work differently: Even when playing the same piece of music -- ScienceDaily

One crucial distinction between the two groups of musicians is the way in which they plan movements while playing the piano. Regardless of the style, pianists, in principle, first have to know what they are going to play -- meaning the keys they have to press -- and, subsequently, how to play -- meaning the fingers they should use. It is the weighting of both planning steps, which is influenced by the genre of the music. According to this, classical pianists focus their playing on the second step, the "How." For them it is about playing pieces perfectly regarding their technique and adding personal expression. Therefore, the choice of fingering is crucial. Jazz pianists, on the other hand, concentrate on the "What." They are always prepared to improvise and adapt their playing to create unexpected harmonies. "Indeed, in the jazz pianists we found neural evidence for this flexibility in planning harmonies when playing the piano," states Roberta Bianco, first author of the study. "When we asked them to play a harmonically unexpected chord within a standard chord progression, their brains started to replan the actions faster than classical pianists. Accordingly, they were better able to react and continue their performance." Interestingly, the classical pianists performed better than the others when it came to following unusual fingering. In these cases their brains showed stronger awareness of the fingering, and consequently they made fewer errors while imitating the chord sequence.
- www.sciencedaily.com