A male baltimore oriole arrived this morning at 5:15 and began singing LOUDLY to stake out our yard as his territory and call for a female.  If things develop like last year, a second male will show up and we will have 2 of them start singing back and forth each morning at 5AM for about 3 weeks or until one moves on.  Guess I'll be going to bed early for awhile so I can get some sleep.