I'm getting the same thing. Tuned in to 'American Woman' at around 0314 or 0315. Several other songs have followed, including... is that Paul Simon? I haven't recognized any of the others, but it sounds vaguely American-themed to me. Good signal into southern Wisconsin, if plagued by static crashes. No ID as yet.
Edited to add: Station seemed to sign off shortly after that last Paul Simon or similar song. Never did get an ID.
Edited two: Looks like, from another thread on the subject, that we all heard Wolverine Radio. Huh, coolness.