Ia is the name of more than one artist:
1) ritual ambient
2) JHETT
3) ambient/drone
4) Vocaloid
5) Finnish metal band
https://soundcloud.com/ialegions


Also see I.A.

4) IA -ARIA ON THE PLANETES- (イア) is part of the Vocaloid3 series. Her voice is provided by Lia, who is known for "Tori no Uta", the opening theme of the visual novel Air. Her design is illustrated by Aka Akasaka, while the design direction is by Maxilla inc.

She was released on the 27th of January, 2012, and has a light toned voice that is soft and relatively clear. Her voice is similar to her provider's vocals, making her one of the more realistic Vocaloids. She is suited best to ballads that feature her strong lower range. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.