That Elvis Costello is more popular than Mobb Deep on the lesson is not something I've noticed and obviously (?) not really the case. Probably just someone who ranked Elvis very highly. However, the higher placings (like top 10 or so) dhould be fairly representative of the Lesson's general taste based on the amount of participants in the poll which is still a bit too low. I don't really know how many participants that needs to be involved for this to be statistically sound since it's hard to know how many people there are that frequent the lesson.