I have been recording nocturnal migrants from my yard since the fall of 2012.  Although I have pretty good hearing, I need my sleep, and so in 2012 I invested in a parabolic reflector, a mic, and a recorder to do the work for me. Every morning, spring and fall, I check the voicemails to see who has passed overnight. Early in the morning of Saturday October 19th, one or more Black Scoters flew overhead en route to the coast from breeding grounds in eastern Canada. The scoter joins Long-tailed Duck and Brant which have graced my airspace during the dark hours. You can hear the recording at the link below (the first high pitched call is a song sparrow). Many folks think it reminiscent of sleigh bells.

https://macaulaylibrary.org/asset/184061361