The label formed in 2001 as a brand of the publishing company VisualArt's and was established to catalog and release music related to visual novels produced by the brand Key, also under VisualArt's.
Key Sounds Label's roster features Japanese bands and singers, several of which originated from the I've Sound techno/trance music production group under VisualArt's, such as Ayana, Lia, Mell, and Eiko Shimamiya.
Other artists including Annabel, Chata, Eufonius, Karuta, LiSA, Marina, Runa Mizutani, Psychic Lover, Rita, Harumi Sakurai, Haruka Shimotsuki, Keiko Suzuki, Miyako Suzuta, Aoi Tada, Tomoe Tamiyasu, and Nagi Yanagi have also released records through the label.
Key Sounds Label catalogs their releases on three indexes: KSLA/KSLM, KSLC and KSLV.
"—" denotes unassigned catalog numbers or releases not applicable to music artists.