This Mortal Coil were a collective of artists primarily attached to the 4AD label, brought together by label head honcho Ivo Watts-Russell was boss and president at the time.
This, from the 4AD website:
“This Mortal Coil was not a band, but a unique collaboration of musicians recording in various permutations, the brainchild of 4AD kingpin Ivo Watts-Russell. The idea was to allow artists the creative freedom to record material outside of the realm of what was expected of them; it also created the opportunity for innovative cover versions of songs personal to Ivo.”
Nowhere was this freedom more apparent than this, from 1991’s “Blood” album, featuring the gorgeous tones of Tanya Donnelly and Kim Deal, both of whom I always thought were criminally under-used as lead vocalists in Throwing Muses and Pixies respectively: