I didn't manage to get a recording, so I can't remember exactly what it sounded like, but I am confident it wasn't a Bell's. It was hopping from branch to branch and singing, so it was hard to get a good picture, but I like warbling vireo based on the colors. Listening to the warbling vireo's song on ebird, I am not 100% that that is what I heard, but I am more inclined towards WAVI than BEVI. Thanks for the help! ?