All of them. My friend mentioned they have villagers they've never seen sing and I was like "what, really?"
Granted, some sing MUCH more often than others. Savannah and Marshal love singing and do so every day. Meanwhile, I had Stitches for weeks before I ever heard him sing, and it slightly disturbed me because his singing voice is several orders of magnitude lower than his speaking voice... How is he doing that
The most villagers I ever saw sing together at one time was four. It happened exactly once and I took a video cuz I didn't know that could happen.
i've seen punchy, scoot, kyle, eugene, cyd, lolly, tangy, and audie sing... haven't seen stinky or tom sing yet but they haven't been on the island very long
Marina. She sings. ALL THE TIME! But it is so cute
Even if I find her in the corner of my island nowhere near a radio, shes still awkwardly bobbing a long to the music hahaha.
Marshal sings a lot, but other than him it’s rare for me to find someone singing but I get super excited when it happens!! I set up a little mic and radio near the plaza where they mostly congregate and still no avail, I have yet to see someone sing on it
Chief sings and sings and sings. He also plays the drums very well, he's especially good at drumming and singing to bubblegum KK. Chief will sing for a long time usually around half an hour to an hour whereas the rest of my villagers just sing for a couple of minutes if they do sing
I’ve seen most of my villagers sing but it’s the ones with the music interests that sing the most. I currently have three normal personalities on my Island Poppy who is interested in education you can see her wearing glasses and reading. Merengue who is nature she’s the one most likely to water flowers. Skye who likes music she’s the one who sings the most. I also have Julian another music lover. I’ve noticed that they will learn new music if you put a radio down and sing it all over the place it’s funny to get them to sing certain songs.
I've seen each of my villagers sing at least once
Genji, Flurry, Audie, Bruce, Goldie, Sherb, Marshal, and Phoebe.
Zell though, is new to my island. I've seen him dancing and tried to wait for him to sing but would get impatient and continue playing.
Including the ones I no longer have: Rodney, Vivian, Agent S, Rex, Pashmina, Plucky
For groups, it's usually Genji and Sherb and sometimes Bruce with them. I've also seen Plucky and Flurry.
Bluebear, Blanche and Cesar, though, did not. But they didn't spend much time on my island.
When I had Claudia, she sang CONSTANTLY, but only in forests or behind houses. Shy I guess! Lopez and Zell did quite a bit of singing, too, while I had them, but Claudia specifically stood out because she would only do it in weird places, whereas the others would just stand out in the open and belt out a song.
Now it's Marshal, Static and Caroline who sing the most on my island.
Cherry sings a LOT. Some of my newer villagers are listed here, but they don't sing yet, they only dance a bit, probably because they're new to my island.
Mostly Ursula, but Marshal also sings sometimes. Last night I was standing in Audie's house for a while and she started singing along with her stereo :3 I don't think I've heard any of the other villagers sing yet..