These are 2 separate and different shows on PBS in the U.S. yet only "Great Performances" is on the site currently. The problem is a lot of episodes showing in this show belong to "Great Performances at the Met" and not on/in "Great Performances". Even tvdb.com has episodes from both shows mixed into one show in error.
Great Performances began airing on 4 November 1972 - http://www.tvtango.com/series/great_performances
Great Performances at the Met began airing on 24 January 2007 - http://www.tvtango.com/series/great_performances_a...
The next episode that is showing here on "Great Performances" after tonight's episode is titled "ILTrovatore" on 22 January 2016 at 9 PM, however according to the PBS website this episode really belongs to "Great Performances at the Met" here - http://www.wjct.org/tv-schedule/
Now either I can add or someone can easily have the missing show added however how do we remove the episodes that are currently showing on "Great Performances" in error and then renumber all the other remaining correct episodes?
