1. "Onion Swinging Song" is a polka (Polkka) dance song from Finland. It is a local ballad in the capital Helsinki. The version that is mainly circulated among the people and recognized by most people is the cover version sung by the Japanese virtual singer Hatsune Miku, which lasts 2 minutes and 28 seconds.

2. "The World's No. 1 Princess" is the fourth original single produced by Japanese musician Ryo using Hatsune Miku and submitted to Niconico animation before the music group Supercell was officially formed.

3. "Uta no Uta no Kono" is a lyrical healing song originally sung by Hatsune Miku. It was uploaded to Niconico Animation by the Japanese fandom host Doriko at 05:34 on January 20, 2008. . Together with the sister singles "Yuhizaka" and "Letter Song" written by Doriko, they are called Doriko's tear-jerking trilogy and have been sung in many concerts.

4. "Yuhi Saka" is one of Doriko's early works. It is a lyrical and healing song, and it is also a divine song recommended by fans of the V family. Together with "歌にshapedはないけれど" and "Letter Song", it is known as Doriko's tear-jerking trilogy.

5. "Letter Song" (Translation: To Me Ten Years Later) is a song produced by Doriko and sung by Hatsune Miku. It is one of Doriko's masterpieces. The style of the song is a ballad. The song is a A very heartwarming and touching song, and has been widely covered.