A "natural break" is any point where, in the reasoned opinion of the licensee, the ID does not interrupt the flow of the station's programming. One can, and it has long been accepted, not ID between movements of a symphony despite the thinking of some that "they are separate cuts on the album". To a classical programmer, the movements are intended to be heard sequentially, without anything else between them.
Not long ago, I heard one of the hosts at WMNR Monroe, CT, remark on the length of Mahler's Ninth, which he had just played in full, all 90 minutes of it. Unfortunately I only caught the end of the piece and wasn't listening at the top of the hour. I can't see any way he could have avoided having to slip a legal ID in somewhere, no matter where on the clock the piece started, do you?
I've also heard the Mahler piece on Sirius XM, but, of course, satellite radio isn't bound by the FCC voice ID rules, and its individual channels don't have call letters anyway.
WMNR is a community station and its hosts are all volunteers, but it does have a recorded fully legal ID that it plays within 5 minutes of the top of the hour, normally. I often wonder what happens, if anything, to similar stations who allow their non-professional specialty show hosts to vary from the formula. WPPB Southampton, NY, and WPKN, Bridgeport, CT, have several who go call letters-frequency-city, or call letters-"right here in"-city, or something similar, and I still recall with a smile to this day hearing the jock on a weekend soul request show on MIT's old WTBS Cambridge, in the '70s, smoothly recite "You got WTBS, 88.1 on the FM side of yo' radio slide, in Cambridge!" I'd hate to think he cost the station money by doing that.
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