Just heard this lovely, sensitive performance by Misa Mead. I hope that she continues to perform jazz ballads, because it's so rare to hear the euphonium played well in this style.
https://www.youtube.com/watch?v=32sDEPS-0ks
And here's the Thad Jones version (which she credits in the YouTube banner.)
https://www.youtube.com/watch?v=-M2ADUgffFE