ECHO BLUE is an album by sigotositeP featuring KAITO. It is released by KarenT for VOCALOID PARADISE Extra Edition 2. It focuses on classical and folk songs and consists of 10 tracks; 6 are new songs and the other 4 are remastered versions of the previously published songs. MEIKO and Kagamine Rin/Len are also featured for the choruses of 2 songs; "Michi Kaze Sora Uta" and "Kyouko", respectively. The album also includes an instrumental bonus track. A crossfade of the album could be heard here.