"Homer's Barbershop Quartet"
Britney Spears.
There won't be an "exact" number until the show if off the air & the number of guest stars increases by one or two or more pretty much every episode.
Your question cannot be answered. You asked "in the following episodes" but yet you didn't provide a list of episodes to choose from. Please update your question so it can be answered properly.
Mel Gibson, Marcia Wallace & Jack Burns
Yes. Dove Cameron Will be a guest star in an episode of Girl Meets World.
The Ramones guest starred in Season 5 Simpsons episode "Rosebud", widely considered to be one of the best episodes in the cartoon's history, written by John Swartzwelder.
Tony Bennet
"Brush with Greatness" was the name of that episode. Check out the related link below:
Britney Spears.
Brett Hart made a guest appearance in the Simpsons. The episode he appeared in was 'The Old Man and The Lisa' and was first broadcasted on April 20th, 1997.
Paul and Linda McCartney made a guest appearance in "Lisa the Vegetarian", the fifth episode of the seventh season of The Simpsons.
There won't be an "exact" number until the show if off the air & the number of guest stars increases by one or two or more pretty much every episode.
there has to be some guest stars on that season finale
Tony Blair
See Provided Link
The Simpsons
The Simpsons has used guest stars since Season One. They aren't using anymore "today" than they were when they started. What exactly are you asking?