There are 4 bands with the name Alas.
(1) Alas is the brainchild of Erik Rutan (Morbid Angel, Hate Eternal), and has released one album, Absolute Purity as of this writing (in addition to a split and a demo). The vocals are provided by Martina Hornbacher-Astner.
(2) The Argentinian band combined elements of progressive rock like Emerson, Lake & Palmer with fusion along the lines of Return to Forever. There are also tinges of Argentinian music, especially Astor Piazzolla. Read more on Last.fm