touhou

There are at least three AK. One is the British girl group,Atomic Kitten.
In Taiwan's album, we used AK as a shortened name.
Member are Liz McClarnon, Natasha Hamilton ,and Jenny Frost.
The group has changed member for twice.
After they released their Greatest hits, they also made both only Asian and British released collection album.
Natasha also started her solo career.

The other one is a Japanese singer-songwriter,Kakihara Akemi(柿原 朱美). AK is from her name's first and second letter.

F9, also known as Kiyono (きよの), is an utaite whose voice is described to have a "crystal clear" quality to it, along with the ability to hit high notes and maintain control. She first debuted under the name Kiyono in the summer of 2007, and mostly sang covers of Sound Horizon songs. On March 31, 2008, she uploaded a cover of minato's Soar. The video quickly rose to the #1 spot in the music rankings (there was no "utattemita" category back then), and minato himself wrote a blog post detailing how he was overwhelmed with feeling by F9's voice.

CONE was founded by the Dutch Hermann Blaupunkt, guitarplayer in Het Droste Effect, former guitar player for stoner rock outfit Lupu Negru and owner of Studio Casa Cassette. The guitar and other string instruments will always be important in CONE output. Freaky folk parts blend with field recordings suddenly ripped apart by a fuzzy guitarsolo or a subtle noise passage. Apart from the guitars, there’s toy instruments, voices, effect boxes, organs, field recordings from all over the globe and other stuff.

There are three artists called XI: 1) Xi is the name of a doujin artist from the circle AQUAELIE that makes metal arranges of touhou music. 2) Xi start from the desire to play the best rock music they can to as many people as they can. Along the way they create songs that reflect their lives and relationships in an increasingly complex world. Musically, they acknowledge their antecedents in rock while always striving to achieve something contemporary and new. Energetic, upbeat and complex enough to be interesting while remaining accessible enough to simply get down to.