歌に形はないけれど (Uta ni Katachi wa Nai Keredo)

Background
This song was uploaded on January 19, 2008, and is doriko's second work. It is one of Miku and doriko's most notable songs, reaching over 2,000,000 views in Nico Nico Douga. It is featured in the MikuPa 2011 concert, the MikuPa Sapporo concert, the MikuPa Singapore concert, and the MikuPa 2012 concert.