Recently came across the website It features (a Capella) samples free to use through Creative Commons licenses.
At ccMixter I found the a Capella tracks by Shannon Hurley and decided to base a song around one of them. Without ever listening to the original song (including instrumentation), I built chords around the a Capella track for ‘We are in love’. I think it turned out pretty good, and today I finished the final mix.

YouTube Link