F9, also known as Kiyono (きよの), is an utaite whose voice is described to have a "crystal clear" quality to it, along with the ability to hit high notes and maintain control. She first debuted under the name Kiyono in the summer of 2007, and mostly sang covers of Sound Horizon songs. On March 31, 2008, she uploaded a cover of minato's Soar. The video quickly rose to the #1 spot in the music rankings (there was no "utattemita" category back then), and minato himself wrote a blog post detailing how he was overwhelmed with feeling by F9's voice.
Cuushe, who is greatly inspired by music like Board of Canada, L’altra, started out her musical career as a member in a collage pop band, and eventually ventured into solo-project works in 2003. Using her mesmerizing airy vocals as the main instrument, Cuushe composes pop-infused electronic music that is lovable and yet uniquely different from any other song-based pop sounds out there. Together with the delicate lyrics penned by her, the multi-talented cuushe beautifully projects a subtle musical world that is carefully wrapped with sensitive emotion and fragile memories.