Fred Jacobs has a great blog on the issues facing rock formats, and a lot of his brilliant musings are universal truths.
i.e. when one station vacates a format, it always seems like one company's dead lawn is another one's greener pastures.. and so it is in LA right now:
First: No "Happy Jack" In L.A.? Not long afterward: Jack LA - Postscript
Tale of Two Bar Graphs: Country Shares and Music Scores - If you want to see just how long the current ‘up’ ratings cycle has been going on for country, this just-released Nielsen bar chart and This Week In Music...
45 minutes ago