そいやっさぁ!! (Soiyassaa!!)

==Background==
"Soiyassaa!" was first uploaded on October 10, 2009. In Shuujin-P's video description he mentioned how "he wasn't confident on how good the song was but he wanted everyone to listen anyway".
A year after the song was uploaded, when -Project DIVA- Arcade was holding its second song submission contest, Shuujin-P uploaded a shorter version of the song with higher quality audio as an entry. It was later chosen as one of several songs to be included in the game.
The song tells a story of battle, to be more precise, the "spirit of a battle". Len and Rin can be heard shouting throughout the song (one of the examples is the title itself, which can be interpreted as a shout / battle cry "SOI YASSAA!"), and that is often done in Japanese festivals and such.
==Succeeding versions==
==Lyrics==
Japanese (日本語歌詞) 	Romaji (ローマ字)
さぁさぁはじまる大活劇 	saa saa hazimaru daikatugeki,
主役はもちろん俺様さ 	shuyaku wa mochiron ore-sama sa
いっさいがっさいやっさいもっさい 	issai gassai yassai mossai,
俺の背に見蕩 レン な 	ore no se ni mito Len na
遥 ルカ 上から俺たちを 	ha ruka ue kara oretachi o
ミク 出してるつもりのあんたらも 	miku dashiteru tsumori no antara mo
いっさいがっさいやっさいもっさい 	issai gassai yassai mossai,
俺らに夢中だ　なぁ 鈴 ？ 	orera ni muchuuda, na, Rin?
 	
先の見えない浮世を 	saki no mienai ukiyo o
照らすはアタイらの御威光 	terasu wa ataira no goikou
唯我独尊 	yuigadokuson
天上天下 	tenjoutenge
アタイらの後ろ通 リン せ 	ataira no ushiro too rin se
 	
愛なんて 	ai nante
 	
しゃらくせぇ 	sharakusee
 	
風より迅く　飛び去れ 	kaze yori hayaku tobisare
鳥より　鷹く 	tori yori takaku
この胸の鼓動が終る前に 	kono mune no kodou ga owaru mae ni
この手の先に示した運命ならば 	kono te no saki ni shimeshita unmei naraba
きっと変えるさ 	kitto kaeru sa
 	
アタイらには 	atairaniwa
 	
かなわねぇゼ？ 	kanawanee ze?
 	
より詠く語り継げ 	towa yori eiku kataritsuge
より　篤く 	hito yori atsuku
この道の轍が消えぬ為に 	kono michi no wadachi ga kienu tame ni
その背の仲で繋がる 	sono se no naka de tsunagaru
ならば 	futari naraba
きっとやれるさ 	kitto yareru sa
 	
もういっちょ 	mou issho
 	
風より迅く　飛び去れ 	kaze yori jin ku tobisare
鳥より　鷹く 	tori yori takaku
この胸の鼓動が終る前に 	kono mune no kodou ga owaru mae ni
==Derivatives==
==Other media appearances==
===Discography===
This song was featured on the following albums:
* imparfait
* 初音ミク -Project DIVA Arcade- Original Song Collection Vol.2
===Video games===
This song was featured in the following video games:
*Hatsune Miku -Project DIVA- Arcade
*Miku Flick/02 (DLC)
*Hatsune Miku -Project DIVA- Arcade Future Tone
*Hatsune Miku: Project DIVA Mega Mix+ (Extra Songs DLC)
==Gallery==
Games - Project DIVA Arcade - Soiyassaa.png|Music jacket featured in -Project DIVA- Arcade and -Project DIVA- Mega Mix
==External links==
===Unofficial===
Category:Original songs
Category:Japanese songs
Category:Songs featuring Kagamine Len
Category:Songs featuring Kagamine Rin
Category:Japanese duet songs
Category:Contest songs
Category:Video game songs
Category:Mobile game songs