Evolution of SpongeBob SquarePants' Voice Speaking and Singing - Latin American Spanish
Here's a video where I've included all the voices SpongeBob has had from season 1 to the present. His singing voice has also changed, so I've included them in the video so you can hear all the changes. At 2:04, I included voice 1 and then voice 2, since those two voices were used in the same episode for the songs "Oh Krusty Krab" and "On This Day." That's why I included season 6 twice. Only voice 2 is still being used, according to what I saw on TV. xD