Mystery solved!

pixabay #7074795
For years now, at our weekend home, in the spring, I have caught the song of . . . somebody feathery . . . and my mind would launch immediately into a whistled intro to of Rodgers & Hammerstein’s classic, It Might As Well Be Spring { as performed live by The Stan Getz Quartet & Astrud Gilberto in 1964, and found on Getz Au Go Go } .
Why? Apparently, Mr. Getz { appropriately } incorporated the song of the White Throated Sparrow into his sax intro for this version. It’s been bugging me for all these years, and now I know which bird it is that starts up that song on the inner juke.
{ Now if I could only hear again and identify that other bird, used as another classic intro . . . }