Backing vocal singers "Make it easy on yourself" 1

[robbievogue]

Hello Bacharach lovers, never am I able to find a listing of the backing vocals singers on this album - who are the mysterious ladies singing their dulcet tones? Does anyone know? Also, who sings backing vocals on "Something big" The same ladies? Thanks!!

[gabba]

i'm quite sure that two of the ladies singin' are Marylin Jackson and Valerie Simpson...