Roots of KinKi Kids

Heart Station is the seventh studio and fifth Japanese-language album by Japanese-American recording artist Hikaru Utada. It was released on March 19, 2008, by EMI Music Japan sublabel Eastworld, and globally on March 26, 2008. It is Utada's eighth consecutive studio album to be fully written and produced by them, with the co-production completed by Teruzane Utada and long-time collaborator Miyake Akira. Recorded between 2006 and 2008, it was worked on whilst they were recording their ninth studio and second English-language studio album, This Is the One (2009). With the album artwork photographed by Japanese photographer Mitsuo, Heart Station was released in two formats: a physical CD, and as a digital download.

4 Hot Wave is the 32nd single by Japanese singer Koda Kumi, released through Rhythm Zone on July 26, 2006. The singles contains the quadruple A-side tracks "Ningyo-Hime", "I'll Be There", "Juicy", and "With Your Smile". All four songs were included on Kumi's fifth studio album Black Cherry, released in December 2006.