There are multiple artists under this name:
1. An 80s vehicle for Kansas band member Kerry Livgren
2. A mathmetal/hardcore band from L.A
3. A project by Jarbas Agnelli and Waldo Denuzzo, from Sao Paulo, Brazil
4. An electro-industrial band from Turku, Finland
5. A minimal synth band. 1. AD is an 80s vehicle for Kansas band member Kerry Livgren. Two albums were released under it: Art of the State and Reconstructions. Two more were released under Kerry Livgren/AD.