《刀劍神域 Lost Song》(日语:ソードアート・オンライン -ロスト・ソング-,英语:Sword Art Online: Lost Song,中国大陆官方译为「黑衣剑士 失落之歌」)是由Artdink開發、萬代南夢宮遊戲發行的動作角色扮演遊戲,可在PlayStation 3、PlayStation
one song, the crowd was to start singing "Oh lay, oh lay". Not only did the crowd do this, but they continued to sing this following almost every song played