Sources confirm Ienner among those to be questioned.

Sony Music Label Group U.S. president/CEO Don Ienner and at least a dozen other Sony BMG executives received subpoenas in recent weeks in New York’s ongoing probe into radio promotion activities, sources confirmed today (May 19).

These are the latest subpoenas served in the investigation by New York attorney general Eliot Spitzer’s office. Ienner is understood to be the highest-ranking executive yet served.

“We fully appreciate the nature of the attorney general’s inquiry and we are pleased to be providing assistance in this matter,” a Sony BMG spokesman says.

EMI Group confirmed last October receiving a request for “information regarding practices in connection with the promotion of records on New York state radio stations.”

Since then, Warner Music Group, Clear Channel Radio and Cox Radio have disclosed receiving subpoenas in the industry-wide investigation. Universal Music Group, Infinity Radio and Entercom have reportedly been served as well.

The investigation appears to be progressing with Sony BMG more rapidly than with the other major labels. However, there is no indication that there is any greater focus on Sony BMG than on any of the other companies.

A spokeswoman for Spitzer declined to comment. The Sony BMG subpoenas were first reported today (May 19) by the New York Post.