Casii Stephan has a “powerful, versatile voice and a fascination with ‘the challenge of writing a hook that will get stuck in people’s heads.”’ (Tulsa People) Stephan has been compared to Florence Welch, Fiona Apple, and Carole King, 

In 2016, she released the single, “I Like The Way,” which won an Independent Music Award for “Best Love Song.” In early 2017, she was named “One of nine Oklahoma musicians to watch” by the Tulsa World Magazine. That year proved to be an exciting and successful year. She, along with her band, The Midnight Sun performed an official SXSW Showcase opening for Hanson, performed at MisFEST, Tulsa’s first female-driven music festival that Casii helped to found and produce, and released a new single, “GhostShips."

In 2018, Stephan released “Letters”, her first fully self-produced single it received accolades from idobi radio, B Sides and Badlands, Tulsa World, Tulsa People, and more. The official music video of “stunning visuals” to this “driving track” was recently premiered by  Substream Magazine. “Letters” is Stephan’s foot-stomping, hand-clapping response to the frustration of dating in the digital age.  In 2019, Casii Stephan and The Midnight Sun performed an official SXSW music showcase in Austin, TX as a part of the Tulsa Music Showcase. Her performance received recognition from American Songwriter as a “knock out set of blues-funk soul” and At Large Magazine raves about her “dynamically talented” band that “augments yet never overwhelms her vocals” and “play off of each other like a band that’s been together for years not just a year”.