I have the Rhode Island state database. The mnemonic for the palm warbler says "trill (weak and buzzy)" but when I play the Sound Recording, it doesn't sound to me like any of those descriptions: It's not a trill, it's anything but weak, and I don't hear any kind of buzziness.
This could, of course, be just my ear. But I'm wondering if it's possible that the database got the sound recording for this bird confused with some other?
I'm new to birding, so perhaps someone more experienced would listen and say "oh, that's the xxxxx" but I can't do that (yet!).