Mephista
There are two artists with this name:
1) Mephista is a free improvisation trio consisting of Sylvie Courvoisier (piano), Ikue Mori (electronics) and Susie Ibarra (drums).
2) Mephista is a duo of trance producers consisting of Holger Abel and Olaf Darmstadt, existing briefly in 1998 and 1999.