It occurs to me that the oldies and classic rock’n’roll you hear at stereotypically American-themed restaurants (think, say, Johnny Rockets) is actually popular among real-life Americans as well.
What you just described is pretty much the “adult comtemporary” version of Asian pop music. Throughout Asia, female vocals tend to be quite high-pitched… but sometimes so is Mariah Carey. The kids would likely be listening to what sounds pretty much exactly like our bad teen pop (Backstreet Boys type pop) but in native languages and with higher pitched female vocals. You also have Asian metal, punk, pretty much everything we have … with the exception of Japan however the Top 40 teeny bopper pop predominates. (Anyone recall the Thailand hubbub when Thai boy band star Big had his car accident?)
Also absurdly popular in East Asia: karaoke! The cheesier/more “Muzak-y”, the better…
I venture to guess that you’re more likely to hear the same music in Taiwan or the Chinese diaspora in SE Asia than in China itself; in fact the immigrants running a lot of these restaurants are more likely from one of those places than mainland China directly. If you have a Chinatown, you can find Chinese pop of all varieties.
My favorite Asian pop is certainly the old “circle dance” music of Cambodia, which tends to sound more like western pop except for the high pitched female vocals, and the fact it’s in Khmer.