I don’t know why it took me so long to put it together, but I realized why the iPad’s Music app has wooden edges (at least, I assume, until iOS 7). Here’s the Music app:

iPad Music App

And here is the Braun SK4 phonograph and receiver:

Braun SK5

The SK4 was a groundbreaking design by Dieter Rams, a major inspiration of Apple’s Jony Ive. More about Braun design here and more photos of the Braun SK4 here.