Male Backing vocals, harmonies, and gang vocals Needed for one song

Ive got a track. With lead and some backgrounds recorded. need a talented male singer to double the backings, and add: harmonies, ad libs, gang vocals. I need someone who is good at harmonies. Id like to get a bunch of double tracked harmonies for the whole song, and pick and choose, where we use them. Someone who can experiment and improvise ad libs, backing parts, and harmonies, would be great. Just go at it and see what you stumble on (in addition to the parts already written out).