In the 70’s we had Disco which had songs keeping a high energy tempo around 110-120 BPM. These types of songs would usually keep a groove going to keep you moving through the whole track. If we look at the 80’s, things started to become a little bit less disco in the rhythm and blues kind of way. We end up with songs that still share influence from disco but evolve into a different type of upbeat. We could compare songs like ‘Billie Jean’ to ‘Stayin Alive’ and you will see they share some of the same qualities. One of the biggest changes comes during the 90’s, the commercialization of hip-hop. Without diving too far into hip-hop I think we can all see how influential this genre became for modern music.