Never miss another Great Event at The Cotillion. You can now download The Cotillion app for IPhone through the iTunes App Store for free. Android and iPhone users can also bookmark The Cotillion’s mobile friendly website for easy access to concert tickets, audio & video files and more. Wichita’s “Round Mound of Sound” opened in 1960. Go to our History and Timeline page to see the famous musicians that have graced the stage of The Cotillion while forming the foundation of our nations classic American Music scene we all now enjoy and love.