Nature or nurture?

In iTunes I maintain a playlist of songs Casey likes from the stuff he hears me playing. His recent requests to add songs have included the following:

• Symphony No. 5 in C Minor, Op. 67, "Fate": I. Allegro con brio -- Beethoven
• Bust a Move -- Young MC
• Black Horse and the Cherry Tree -- KT Tunstall
• In-A-Gadda-Da-Vida -- Iron Butterfly

That's the tip of the iceberg, believe me. He seems to be adopting his father's eclectic tastes in music.