千年の独奏歌 (Sennen no Dokusou Ka)

Background
The song is yanagiP's most notable work. Not only is this KAITO's first song to have reached one million views, it's also the first KAITO original song to have hit the first rank on the Weekly VOCALOID Ranking. This folk song has many remixes; an album with the title A Thousand-Year Solo was released featuring three remixes by three different producers (sasakure.UK, k-shi, and baker). KAITO Append's version was used as a demo and can be heard in the album VOCALOID Minzoku Chou Kyokushuu.

An interpretation of the song tells of an "artificial" being (KAITO) who is singing a song to someone (possibly a love interest) who has passed away. Even though thousands of years have passed since that person died, and "he" knows that he can never see "that person" ever again, KAITO keeps on singing for that person (thus explaining the title of the song, a thousand year solo).

This song is featured on the compilation albums EXIT TUNES PRESENTS Vocalonation feat.初音ミク, DEBUTANTE, VOCALOID BEST from ニコニコ動画(あお), and Hatsune Miku -Project DIVA- extend Complete Collection.

Other media appearances
This song is featured in the MikuPa Live in Sapporo 2013 Concert, the MikuPa Live in Kansai 2013 Concert, and the MikuExpo in Indonesia 2014 Concert.