I see that barrons.com posted yesterday that EMI has now signed on with SpiralFrog:
September 6, 2006, 2:08 pm
EMI Agrees To Offer Music Through Spiral Frog Free Music Download Site
Posted by Eric Savitz
Spiral Frog, the startup that recently announced plans to offer advertising supported free music downloads, today said a second major music label, EMI, had agreed to participate in the site. Universal Music had previously agreed to offer songs on the new site.
That’s two down, two to go: the company has yet to sign up Warner Music Group or Sony BMG for the new service, which is supposed to launch later this year.
edit for typo