I typed in Contrasting Harmonies in a search engine and besides
colors and visual contrasting harmonies, here's all I got.
The first one is an excerpt from The ap Huw Manuscripts
http://www.standingstones.com/aphuw.html
{This copied material sets out the Twenty-Four Measures, a "series of harmonic patterns composed of two contrasting harmonies, and used as a basis for grounds and variations".
The second one was this:
http://www.jonathankui.com/music/robyn.html
I don't know how her music sounds but she looks pretty hot.
Full Name: Robyn Carlsson
Date of Birth: 1979
Residence: Stockholm, Sweden
Latest album: My Truth (1999)
{Either you've never heard of her, or you've only heard her most popular song, "Show Me Love." I really enjoyed Robyn's first album, as it was a departure from the types of music I had been mainly listening to. Robyn's music is a great R&B style, with great contrasting harmonies and rhythms. Her voice has a raspier tint to it, making it very alluring to listen to. Sadly, I have yet to hear her second album, as it wasn't released in the U.S. Also, I don't think she's recording anymore. }
Aside from an article on Lacuna Coil talking about [Christina's soaring vocal
layers and Andrea's contrasting vocal harmonies] and an aritcle
on Chopin and Strauss, me thinks you are in the wrong class.
Are you sure you aren't in Interior Decoration 101???