Concert
Description
It looks like it is built inside of a giant clam, where the Bikini Bottomites can watch shows and symphony plays. In "Choir Boys," the front entrance has the bow of a boat with windows and doors, as well as large sign reading "concert," however this is not present in its other appearances.
Role in series
"Suction Cup Symphony"
The first time it appears, it is daytime and Squidward hands the manager of the symphony his original piece "The Suction Cup Symphony." During the Bikini Bottom Symphony Orchestra performance of it, SpongeBob and Patrick appear and do everything Squidward did. In the end of Squidward's symphony, the crowd cheers for him.
"Choir Boys"
Towards the end of the episode, the Bikini Bottom Men's Choir and SpongeBob perform here for a concert, while Squidward gets to turn the pages of SpongeBob's songbook.
"The Ballad of Filthy Muck"
Everyone runs away from the concert hall because of Filthy Muck and Little Yuck, so they use the instruments for them to not go to waste. After that, Old Man Jenkins says that their music "stank."