There are some great vocal stems on CCMIxter, available to play with. Miss Snowflake, a prime mover there has provided any number that you can use according to their licence restrictions. This particular song of hers is called 'Foolish Game', and this remix is where it led me. I haven't labeled it unfinished, but it is still in need of some serious tinkering.
A Foolish Game (pell) by Snowflake (c) copyright 2014 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/snowflake/46165