This Bird is Driving Me Nuts

This bird has been singing around the house all day and it’s driving me nuts.  I haven’t been able to spot him/her.  I don’t recognize the song.  I’ve been hearing the song all day and am very curious as to why I don’t remember ever hearing it before and who the virtuoso is.  In this recording (not the best because he was a little further away when I recorded it) you will hear two birds.  One is the robin … and then the high pitched squeaky one is the culprit.  Anyone know?