On Wikipedia https://en.wikipedia.org/wiki/ALEA_Ensemble
Creation 1988
City Graz, Austria
Country Switzerland

The ensemble was founded in 1988 by composer and conductor Gerhard Präsent and his wife, violinist Sigrid Präsent. The name is derived from the aleatoric composition style, but can also be applied for variable combination of instruments for different works, such as the ALEA Quartet. The ensemble performs contemporary music, frequently in combination with traditional repertory. They played and recorded the second and third string quartet by Iván Erőd, string quartets by Gerhard Präsent, and the second to fourth string quartet by Herbert Blendinger. wikipedia