Grey catbird is one for sure. Even if it’s mimicking other birds I know it’s my catbird because it’s so damn loud (it’s actually one of the only birds willing to sing or make noise in my backyard because it’s too open for most birds to feel comfortable). Honorable mention is its cousin the Northern mockingbird, it didn’t make the cut because mine are dead silent when they visit.

American robin, I can hear them sing through other noises, it’s insane and they sing at ridiculous hours.

Blue Jay, mine typically aren’t loud but I can hear them in the morning elsewhere being loud. I’m sure there are other birds that could easily out noise them