Key Sounds Label is not under contract with JASRAC, or any other Japanese copyright collecting agency.

As such, the releases on the label are not sold in Japanese stores with other music albums and singles, but are still widely available for online purchase.

[2] Two maxi singles containing songs sung by Lia were released on the label in December 2002 and August 2003.

[14][15]The first EP on Key Sounds Label contained songs from Air and was only released during the first concert of the Japanese trance music group OTSU held in May 2006.

[2] Both concerts were sponsored by Key Sounds Label, and both EPs were released on gramophone records.

[18] Each time, the concert lasted for two and a half hours and featured songs sung by Lia, Rita, Chata, and Tomoe Tamiyasu who have previously sung songs for singles and albums released under Key Sounds Label.

[19] A two-CD remix album entitled KSL Live World 2008: Pamphlet and Memorial Disc was sold at both concert showings bearing the catalog numbers KSLC-0001—0002 and contains six remixed vocal versions of Kanon's opening theme "Last regrets" on the album's A-side;[20] two of the tracks appeared on previous Key Sounds Label releases, and one is from the 1999 I've Sound compilation album Regret.

[21] The B-side of the album contains a recording of a group talk of the live performers from the concert.

[23] The concert featured songs sung by Keiko Suzuki, Miyako Suzuta, Aoi Tada, Tomoe Tamiyasu, Chata, Marina, Lia, LiSA, Rita and Eufonius; however, Eufonius only appeared at the May 22 concerts.

[25][26] The concert featured songs sung by Tomoe Tamiyasu, Keiko Suzuki, Rita, Suzuyu, Ayaka Kitazawa and Lia.

A fourth concert called KSL Live World: Way to the Angel Beats!

[27][28] A fifth concert called KSL Live World 2016: The Animation Charlotte & Rewrite was held in Toyosu, Tokyo on April 30, 2016.

[30] 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, Kotoko, Lia, Mell, Mami Kawada and Eiko Shimamiya.

Other artists including Annabel, Chata, Karuta, Ayaka Kitazawa, LiSA, Marina, Runa Mizutani, Psychic Lover, Rita, Riya, Harumi Sakurai, Haruka Shimotsuki, Keiko Suzuki, Miyako Suzuta, Suzuyu, Aoi Tada, Tomoe Tamiyasu, and Nagi Yanagi have also been released on records through the label.