{{MusicArticle
| titleen     =Quality Underground
| group       =[[IOSYS]]
| groupCat    =IOSYS
| released    =2012-04-22
| convention  =Dai-Kyuu-Shuu Touhousai 6
| tracks      =12
| catalogno   =IO-0217
| website     =[http://www.iosysos.com/cd/tohou4/ Link]
| length      =53:15
| image       =QUNDER.jpg
| banner      =tohou4_banner_200x40.png
| arranger    =uno/RoughSketch
:D.watt
| lyricist    ={{lang|ja|はかせ}}
:{{lang|ja|オミ織葉}}
:{{夕野ヨシミ}}
| vocalist    ={{lang|ja|あいかぴん}} ([[Raise Clamor]])
:{{実谷なな}}
:{{lang|ja|ちよこ}}
:{{野宮あゆみ}} ([[ALiCE'S EMOTiON]])
:{{lang|ja|高井さん}} ([[IOSYS]])
| producer    =uno/RoughSketch
| masterer    =uno/RoughSketch
| illustrator =ria ([http://ddb25.web.fc2.com/index.html DooDleBox])

| description =It features vocal and instrumental arrangements of themes from ''[[the Embodiment of Scarlet Devil]]'', ''[[Imperishable Night]]'', ''[[Phantasmagoria of Flower View]]'' and ''[[Subterranean Animism]]''.
| tracklist   =

*{{Track|01|Quality Underground (Introduction)|02:07}}
**arrangement: uno
**original title: {{lang|ja|少女さとり　～}} 3rd eye
**source: {{SA}}

*{{Track|02|amorous attention|04:00|lyrics=Lyrics: amorous attention}}
**arrangement: uno
**lyrics: {{lang|ja|はかせ}}
**vocals: {{lang|ja|あいかぴん}}
**original title: {{lang|ja|ハルトマンの妖怪少女}}
**source: {{SA}}

*{{Track|03|Luna Dancing|04:45|lyrics=Lyrics: Luna Dancing}}
**arrangement: uno
**lyrics: {{lang|ja|オミ織葉}}
**vocals: {{実谷なな}}
**original title: {{lang|ja|月時計　～ ルナ・ダイアル}}
**source: {{EoSD}}
**original title: {{lang|ja|フラワリングナイト}}
**source: {{PoFV}}

*{{Track|04|Love Story Beats|04:09}}
**arrangement: uno
**original title: {{lang|ja|少女綺想曲　～}} Dream Battle
**source: {{IN}}

*{{Track|05|fire away|03:39|lyrics=Lyrics: fire away|}}
**arrangement: uno
**lyrics: {{夕野ヨシミ}}
**vocals: {{lang|ja|ちよこ}}
**original title: {{lang|ja|死体旅行　～}} Be of good cheer!
**source: {{SA}}

*{{Track|06|Bubbling Spark (Extended Edit)|04:23}}
**arrangement: uno
**original title: {{lang|ja|恋色マスタースパーク}}
**source: {{IN}}

*{{Track|07|Sky is the Limit|05:33|lyrics=Lyrics: Sky is the Limit}}
**arrangement: uno
**lyrics: {{lang|ja|オミ織葉}}
**vocals: {{野宮あゆみ}}
**original title: {{lang|ja|霊知の太陽信仰 ～}} Nuclear Fusion
**source: {{SA}}

*{{Track|08|Ground Fancy (Extended Edit)|04:30}}
**arrangement: uno
**original title: {{lang|ja|ハートフェルトファンシー}}
**source: {{SA}}

*{{Track|09|Angel on the Bridge|07:05}}
**arrangement: D.watt 
**original title: {{lang|ja|緑眼のジェラシー}}
**source: {{SA}}

*{{Track|10|Feelings of Love|04:00|lyrics=Lyrics: Feelings of Love}}
**arrangement: uno
**lyrics: {{lang|ja|オミ織葉}}
**vocals: {{lang|ja|高井さん}}
**original title: {{lang|ja|封じられた妖怪　～}} Lost Place
**original title: {{lang|ja|暗闇の風穴 }}
**source: {{SA}}

*{{Track|11|DRiNK!|05:57}}
**arrangement: D.watt 
**arrangement: uno
**original title: {{lang|ja|華のさかづき大江山}}
**source: {{SA}}

*{{Track|12|c u again|03:04}}
**arrangement: uno
**original title: {{lang|ja|地霊達の帰宅}}
**source: {{SA}}

}}