There are multiple artists called A-Set:

1) A-Set is a brazilian electronic act. Its music is somewhere between Industrial/EBM/Darkelectro and gets its influences from a lot of different bands like The Klinik, Skinny Puppy, Vomito Negro, FLA, Simbolo, and yelworC, from movies by directors like Bunuel, Kubrik, Lynch, and Miike, books by Schopenhauer, Nietzsche, De Sade, Rimbaud, Poe, Crowley, Austin Spare, and Lautreamont, besides a lot of experiences, emotions, and situations. The list follows... and is huge!

In 2005 the demo "A deadly past raises the future" was released. The new demo is almost ready to be released in 2006.

A-Set meaning is hidden behind
A: Aleph, Alpha, Ayin, Ain, Anubis, Apap/Apophis
Set: egyptian god Set / chaldean Shaitan

A-Set is:
Hilton S. - programs, sequences, and vocals
Wagner AA - vocals

2) Albert Menduno, previously of Mohinder, Calm, and Haelah, began performing solo as A-Set after moving to Chicago. A-Set had releases on Tree, Southern, and Dogprint in the early 2000's.

3) A-Set, AKA Iris Sagan, is a main character in AI: The Somnium Files. In the series, A-Set is a musician and internet idol. She has one song released, which is "Invincible Rainbow Arrow", and there are a few versions of this track, being the ENG and JP versions of both the Grand Finale version, which plays at the end of the game, and the Solo version, which is only sung by A-Set herself. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.