The excellent British band Karnataka features female vocals and a melodic, peaceful sound. They released their first album in 1998 and released two others before disbanding in 2004. The band then reformed but went through a dizzying maze of line-up changes. They released a great new album in February of 2010 entitled "The Gathering Light," that seems to me to be more musically adventerous than their previous (and still excellent) albums, but I miss the heavenly vocals of Rachel (Jones) Cohen, who had been replaced by Lisa Fury who does a fine job -- but now they are now once again without a singer (as made painfully clear on their homepage, which currently is mostly taken up by a large ad regarding this).
Below is a live performance of "Time Stands Still" (and no, that's not Rachel singing; there are other videos on youtube that have her, but I really like this song).