The people who voice The Simpsons.. Love it!

Here's a quote from Wiki to name the main voice givers:

The Simpsons has six main cast members. Dan Castellaneta performs Homer Simpson, Abraham Simpson, Krusty the Clown, and other adult, male characters. Julie Kavner speaks the voices of Marge Simpson and Patty and Selma, as well as several minor characters. Nancy Cartwright performs the voice of Bart Simpson and other children. Yeardley Smith, the voice of Lisa Simpson, is the only cast member who regularly voices only one character, although she occasionally plays other episodic characters. There are two male actors who do not voice members of the title family but play a majority of the male townspeople. Hank Azaria voices recurring characters such as Moe, Chief Wiggum, and Apu, and Harry Shearer provides voices for Mr. Burns, Smithers, Principal Skinner, Ned Flanders, and Dr. Hibbert. With the exception of Harry Shearer, every main cast member has won an Emmy for Outstanding Voice-Over Performance.