マトリョシカ “Matoryoshka” is a vocaloid song created by Hachi (which is a pseudonym of Kenshi Yonezu, a famous Japanese singers). This is one of the songs that have established a new music genre called ボカロ “vocalo” in Japan. Vocalo is music created with 100% synthesized voice, which is often presented with animated characters.

It’s a relatively new music genre (started about 15 years ago) in Japan, but some of you might like it.