So but anyway I was listening to the very decent new album by Guy Garvey this weekend. Near the end comes a track called 'Electricity' which features a guest vocalist whose name I do not know. She had a fair voice and all that (felt a bit like a parody of a jazz singer, tbh) but as so often with guest vocalists, I experienced her presence as a disruption. This led me to the inevitable: when does a guest vocalist add anything to an album? They seem to me to come in for a track, mess up the mood and then piss off again. I felt the same with Richard Hawley appearing on Elbow's SSK. As a one-off track it may have worked, but in the context of the album it sounds like your neighbour popped in midway through the recording and asked to sing a verse for larks