Tracy Thorn is not the vocalist on Tricky's album, nor does she appear on 
Blue Lines. She does however appear on two songs of Massive Attack's 
Protection. She is half of the Blanco & Negro band 'Everything But The 
GIrl', which is not an acid jazz band by any stretch of the term, but is 
nonetheless admired by many list members. (And for good reason. EBTG are 
well worth checking out.)
If I'm not mistaken, the female vocals on Maxinquaye were done by a girl 
named Martine (?) who has not appeared on either of the Massive Attack 
albums. 
% jkulesza@undergrad.math.uwaterloo.ca
% "dream of better lives - the kind which never hate
%  trapped in a state of imaginary grace
%  i made a pilgrimage to save this human's race
%  never comprehending the race had long gone by"