Tokyo-based electronic musician mus.hiba has worked with a handful of vocalists during his short stint as a producer. However, many of them haven't been human.

His go-to voice belongs to Sekka Yufu, who boasts a light delivery that fits with mus.hiba's slowly unwinding swirl of synthesizers. She's a computer-generated voice powered by software called Utau, a free-to-download application resembling the popular singing voice synthesizer program Vocaloid.

"Yufu isn't like Hatsune Miku," mus.hiba says, comparing her to Vocaloid's main megastar. "She's kind of a minor character. She has a whispery voice and nothing like that exists in any of the Vocaloid voice banks. I thought it was very cute."