how itunes classifies my music

I took a look at the "Genius Mixes" feature in iTunes for the first time today, and was impressed with the way that the software grouped my music.

It created twelve different mixes:

1. Jazz Vocals (based on Norah Jones, Diana Krall, Ella Fitzgerald, Billie Holliday)
2. Adult Alternative Pop (based on Sarah McLachlan, Colbie Caillat, Dido, Leonard Cohen)
3. Contemporary R&B (based on Black Eyed Peas, Destiny's Child, En Vogue, Beyoncé)
4. Classical (based on Josh Groban, Berliner Philarmoniker, Yo-Yo Ma, Academy of St. Martin-in-the-Fields)
5. Folk (based on Simon & Garfunkel, Cat Stevens, Tracy Chapman, Christine Lavin)
6. Vocal (based on Michael Bublé, Frank Sinatra, Bing Crosby, Steve Tyrell)
7. Classic R&B (based on Temptations, Prince, Michael Jackson, Diana Ross & the Supremes
8. Country (based on Dixie Chicks, The Judds, Faith Hill, Randy Travis)
9. Folk-Rock (based on Carole King, Paul Simon, Crosby Stills & Nash, Van Morrison)
10. Pop (based on Leona Lewis, Pink, Mieka Pauley, Seal)
11. Electric Blues (based on Susan Tedeschi, Muddy Watters, Jonny Lang, Eric Clapton)
12. Blues, Boogie & Southern Rock (based on Bonnie Raitt, Stevie Ray Vaughan, Santana, Little Feat)

That's about the best set of genre groupings of my music I've seen, and the mixes in each category seem to go really nicely together. The named artists in each group provide an extremely accurate view of the music that I enjoy. That's a very impressive algorithm they've got going on there.