This statistic is interesting, not obvious at all. A mere 39% for pop doesn't seem so obvious to me; interesting that disco, classical, and jazz music are distributed almost equally
I didn't have a prediction for rock.
39% listen to pop music, 22% rock, 9% disco and classical music, 8% jazz and blues
I don't know how optimal listening to classical music in the car is; in fact, among all of them, the surprise for me is the 8% of Jazz. For me, it is an area more linked to the atmosphere and the spontaneity of the moment... rather than the repetitive/obsessive listening of the same performance.