Awesome results from IBM Research. I remember that I showed IBM research in 2003 in Monaco at one of the Game events that research was capable to analyze the compositions and search in all the work from Philip Glass. This takes it a step further.
The structure of three consecutive semi-tones determines the way we hear and perceive music. Simple factors, such as the time between the three notes, the tone between the notes, and the order of the notes account for identifiable trends within the eras of music