After reviewing the 1986-87 season I can tell you that once the show was changed to the 30 minutes, The Top Ten, Spotlight Dance, and The Video Showcase became rarities.Almost everyweek you had Rate-A-Record before a performance the format was broken down like this
song(sometime Spotlight Dance)
Rate-A-Record(Sometimes a song or Video Showcase
song (Sometimes Top Ten)
There is no way in hell you could get that out in 30 minutes today
There were even more changes for the next season. Please see the 1987-88 premiere episode for more details.
American Bandstand was shortened to 30 minutes for the 1986-87 season. And the guest list was cut down to 1 artist a show. There was also a new closing that was a 1986 remix of the original 1957 theme.