Here's an interesting study summarized in today's Live Science:
Songbirds Prefer the Latest Tunes
By Ker Than, LiveScience Staff Writer
posted: 10 July 2007 12:24 pm ET
For male sparrows looking for a mate or trying to defend their turf, it pays to keep up with the times and latest musical hits.
A new study finds that female white-crowned sparrows pay more attention to new bird songs than vintage tunes, and that other males find the oldies much less threatening.
Read the whole article here.