https://www.youtube.com/watch?v=SBOCKYPt_FMObviously a Vireo...leaning towards Blue-headed...seems a bit more relaxed and from recording I heard online they are a bit more relaxed with their songs.https://www.youtube.com/watch?v=Gi-RhJQj_-MHard to say, it's not something I've heard before but it does sound like something Blue Jays could be capable of making. They are great mimickers after all.https://www.youtube.com/watch?v=VZNrSqFc7Uo (the grunting call)Definitely a rail...I'm thinking either Common Gallinule or American Coot?https://www.youtube.com/watch?v=WfG9VspDWn8Wood Thrushhttps://www.youtube.com/watch?v=WfG9VspDWn8 Same video as above
Number three might be a Sora. I found another video that sounds similar, especially towards the end. https://www.youtube.com/watch?v=BqIZW-e2rbg