[1] Itsuki is usually regarded as an enka singer, but he has also released a cover version of Southern All Stars' J-pop song "Tsunami".

Although he changed his stage name to "Eiichi Ichijō" in 1967, and then to "Ken Mitani" in 1969, there was no improvement in his music's commercial sales.

Written by lyricist Yoko Yamaguchi, "Yokohama Tasogare" reached the top of the Oricon weekly single chart.

Also in 2008, he collaborated with the girl group Cute, letting them record the song "Edo no Temari Uta", he himself was planning to include in his end-of-year album.

Cute's producer Tsunku liked the song and thought that if performed by girls the enka lyrics will sound like "a modern fairytale".