Some popular songs in Vocaloid are in Japanese, such as Senbonzakura, Kami No Manimani, Kagerou Days, Yobanshi Deceive, and Otsumiki Recital.

Senbonzakura-One Thousand Cherry Trees
Kami No Manimani-As the Gods Say
Kagerou Days-Heat Haze Days
Yobanshi Decieve-Night Talk Deceive
Otsumiki Recital-Moon Viewing Recital