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"Birthday Song, Requiem" is a collaboration maxi single containing songs sung by former I've Sound singer Lia. It was first released on December 28, 2002 at Comiket 63 in Japan by Key Sounds Label bearing the catalog number KSLA-0007. The single contains one disc with three tracks composed, arranged, and produced by Jun Maeda, Magome Togoshi, Ryō Okabe, and Fishtone. The cover art features a passage from Mark 16:6-7 from the American Standard Version of the Bible.

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Circle of Fifth is a Japanese pop music studio album produced by Shinji Orito featuring nine vocalists. It was released on October 24, 2012 by Key Sounds Label in two discs. The album peaked at No. 81 on the Japanese Oricon weekly albums chart.

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Humanity... is an album featuring songs composed by Shinji Orito, Magome Togoshi, Mitsuru Sekiyama, Yasushi Tanno, and Shigeru Kiyokawa. The album was first released on August 10, 2001 at Comiket 60 in Japan by Key Sounds Label bearing the catalog number KSLA-0001. The album contains one disc with ten tracks; eight of the ten are sung by Hidetsuna Fujita, and Mina Minomo, and the lyrics for the songs were written by Jun Maeda, Tanno, Fujita, and Kazumi Ōtsuka. Excluding the last track, "Tori no Uta ", which is a remix of a song originally featured in Key's visual novel Air, none of the other tracks are related to visual novels by Key.

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Love Song is an album containing songs sung by Riya from Eufonius first released on August 31, 2005 in Japan by Key Sounds Label bearing the catalog number KSLA-0019. The album contains one disc with thirteen tracks composed and produced by Jun Maeda of Key. Additional participating musicians include Kendi Sato on electric guitar for tracks two and twelve, AchillesKEN on percussion for track seven, and Weisswurst on violin for tracks seven and thirteen. Cover art for the album was provided by Yoshitoshi ABe who also provided illustrations inside the album's booklet. Love Song is a concept album which tells the narrative of love as it heads toward ruin.

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Ma-Na is a compilation album first released on August 12, 2005 at Comiket 68 in Japan by Key Sounds Label bearing the catalog number KSLA-0018. The album contains one disc with four tracks remixed from background music from four of Key's visual novels: Kanon, Air, Planetarian: The Reverie of a Little Planet, and Clannad. The tracks on the album were composed, arranged, and produced by Jun Maeda, Shinji Orito, and Magome Togoshi.