The hits keep comin'.

Tectonic plates are shifting and grinding. Finally, the first signs of major movement in the steel-tower radio business can be detected. (1) Two radio groups have chosen to stop reporting music "adds" to record companies and radio-music-biz trades. That's big. (2) Three major radio groups have decided radio news and talk might work on FM. Big. (Will they also decide that actual journalism may have a place on broadcast radio? Too soon to tell.)

(3) Arbitron's "PeopleMeter" data gathering technology has attracted three or four agencies and one radio company, in advance of Clear Channel's announcement of finalist applicants for its new-ratings, please RFP. Small, but could become significant if, as I expect, it becomes the first botched Arbitron strongarm robbery attempt.

(4) Google bought dMarc, a high-tech radio ad-time-selling company, which, with others, like SoftWave, a Web-based unsold-inventory peddling system, has poked a serious hole in the national radio ad-selling dike. Explosive.

Satellite? Ipods? Web radio? Cellphone music-radio? Wi-fi? All huge. But the proliferating hairline fractures in the brittle radio-musicbiz-advertising crust will surely result in creative destruction. Pickaxe, anyone?