One last thought, is the acknowledgment of the amazing Roscoe for "stand up bass, Electric bass and VOCALS", one of the best jokes of the tour, or did I miss lots of other scintillating contributions from my distant eyrie
Well, Roscoe screams "Pleeeaaaasssssseeeeeee" twice during I'm Your Man
ps. Really, he was doing back vocals previously on the old tours, and I think on this one also: in choruses during Ain't No Cure For Love and Closing Time, he is the male vocal singing little higher, "closing time closing time closing time" and also "ain't no cure ain't no cure etc." I am sure he was doing this on this tour also, on Closing Time, I recall he was standing with his bass guitar at the microphone on the show in Italy and I remember he was singing.
Songs with male vocals in chorus usually were: Dance me... ("la la la" parts), The Future ("repent" parts), Ain't No Cure for Love (chorus), Heart With No Companion (chorus), Closing Time (chorus line), maybe Democracy ("Sail On" chorus), I'm Your Man ("Please" scream) ... you can see the logic of its use, beside the usual female backing.
To tell the whole truth, I always thought that male vocals are sometimes ruining the ladies on those songs - Closing Time needs it (he's the voice of the boss), but I felt, while listening the old bootlegs, that Ain't No Cure for Love and Heart with No Companion were little ruined by presence of male vocals beside Perla's and Julie's, and now Webb Sisters'... In 1993, bass player was Jorge Calderon and he did those parts instead of Roscoe, you can clearly hear him during Ain't No Cure on bootleg from LA (Columbia Radio Hour aka First We Take L.A. aka Above the Sun). Later in the tour, and on Cohen Live official release, his vocal was either mixed to be less intrusive, or even he stopped to add it (I recall how I heard him during "la la la" parts in Dance Me... and didn't like it beside the ladies' vocals).