Hatsune Miku
Hatsune Miku was the first Vocaloid developed by Crypton Future Media after they handled the release of the Yamaha vocal Meiko and Kaito. The name of "Hatsune Miku" was conceived soon after the Vocaloid 2 announcements, when an English and Japanese vocal were developed for the character. The intended design was delayed and later used for Megurine Luka instead. Miku was intended to be the first of a series of Vocaloids called the ""Character Vocal Series"", which included Kagamine Rin/Len and Megurine Luka. Each had a particular concept and vocal direction.
Exist Trace
In 2013, Exist Trace introduced their 'new world' musical direction, where long-time main lyricist/composer miko would officially be taking a dual-vocal position with Jyou. The twin vocal style was emphasized on 2013's single "Diamond". In 2014's "Spiral Daisakusen", the pair again share front billing and the center spot on the music video. The first album to fully incorporate the twin vocal style, "World Maker" (2014), revealed an improved duet system, where vocals are typically heavier towards Jyou in allocation, but making good use of miko's sweeter counterbalance. After an album gap of 1.5 years, the band released the "This Is Now" mini-album, an energetic offering with more of a metal feel than previous releases (including a return to growling from Jyou and backup snarls from Omi and Naoto), as well as re-recorded versions of the singles "Twin Wings" and "Shout Out". In Japan, the EP sold out within a day, across such stores as ZEAL LINK, Disk Union and BRAND-X.