Seeing these comments right now, even if this maybe not the appropriate place to talk about, remind me of the experiences when listening to VOVGT/91fm in Vietnam.
I think I have rant about this too much, but the VOVGT network is set up like a “federalized” network, rather than centralised/unitary network. This is because the Saigon and Hanoi station is operating independently of each other, and there are no network feed per se, meaning that during the network programming, the Saigon station has to relay the Hanoi station if the program is produced in Hanoi, and vice versa (maybe a mock analogous situation is that Gold 101.7 would relay Gold 104.3 for Melbourne-produced network programming, and Gold 104.3 would relay Gold 101.7 if the same networked content is Sydney-produced). In the VOVGT schedule, networked programming are produced from Saigon during afternoon on even days and evening on odd days and weekends, while Hanoi produces networked content on afternoon on odd days and evening on even days.
Because each of the station has own music library system, and separated from the rest of the VOV network, it is technically impossible to have a situation when the two station are playing the same sequence of songs but with different announcer. This could also mean transition to network programming would often be botched, because the songs would be abruptly switched (because the two stations run separate automated music filler at the same time. In smoother cases, it may took a bit of silence (after the song has completed) before switching.
Musically it can be all over the place like The Breeze or rural AM stations in the Western world, even in the same program. Because music playing on the stations are, in most cases, responsibility of the announcer if there are currently no request programming.
I really enjoy the Greatest Hits music program at the weekend (not the usual classic hits like in the US) because there are many bizarre songs being played, and the announcer even sometimes mispronounced the songs, like Those Damned Blue Collar Tweekers, and, in other cases, even played very explicit songs such as F*** Macarena. I think this can explain it all (also, I really like The Nostalgic Songs, it played rare Viet songs that had not been played on the radio for about 3 - 4 decades now).
(Also, VOVGT Saigon also ran MekongFM, an opt-out service for Southwestern Vietnam, but it produced mostly local output from the Saigon studio between 6am and 8pm on weekday, and until 7pm on weekend)