Ooops ..... in my excitement, my mittens made the typing more difficult !

My backing files are minus the lead vocals as well as the piano parts. Some have guitar parts left out that I play live as well! My simple method is to use the arranger with the piano part muted and I sing harmonies with the lead voice turned way down or off ...depending on the effect I want. Listen to "Nightingale" here: www.boydsongs.com
That was recorded with RH piano, LH bass, drums (9k pro) and 3 part harmony. If I was to do that one live - I'd simply mute the piano, and fade down my lead vocals.