There are at least five bands called ADD or Add:
1) A Russian experimental band (pictured)
2) Music released by Jeff Fal of Boulder, Colorado, at http://actdead.com/
3) A group from Finland, http://www.myspace.com/rocbandadd
4) A female-fronted rock band from Chicago.
5) An emerging young artist from Annapolis, Maryland
* ADD #5 (from Annapolis) specializes in a variety of different styles of music, ranging from Hip-Hop/Rap to Acoustic Guitar. Read more on Last.fm.