I usually hear the sound of a singer's voice as music, and let the words just drift over me. I have always seen music as colours and shapes, and some singers voices produce tastes (Max Bygraves = suet pudding; Jim Causley = gooseberries and custard). The Bee Gees unfortunately make me feel nauseous. It isn't necessarily a comment on their singing, it's just the effect their particular sound has on me.