Melody...

Background
The song is about Miku's gratitude to VOCALOID users for giving her a song to sing, and how she wants to move people with her song. The song is very famous and both the song and the PV are instantly recognizable to most VOCALOID fans.

The song became popular due to the 3DPV released by Ussy-P and Kio, reaching more than a Million Views. There are two versions of the song, the second one adding more depth to the original.