Not about the chords.
But this episode might be of interest. It talks more about the music than most programmes in this series.

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Soul Music - BBC Radio4 - April 2024
Series about pieces of music with a powerful emotional impact
Written by George Gershwin for the musical Oh Kay, Someone To Watch Over Me has endured as a tender ballad about searching for someone special. It has been recorded by many different artists from Ella Fitzgerald to Willie Nelson but it's perhaps Ella's version that is best known.
Lyn Mackay grew up listening to it as a small child at her parents' home in Swansea. As she grew up and became a musician and entertainer the song has changed its meaning to her over the years.
Nica Strunk heard her father singing it during one of their sessions at his piano. As he sang the line "where is the shepherd for this lost lamb?" she began to understand the difficulties he faced in expressing his emotions and the song brought them closer together.
Nicholas McInerny loved Sarah Vaughan's version and his daughter sang it at his second wedding.
Music producers James Morgan and Juliette Pochin have been Ella Fitzgerald fans since they met as students and are thrilled to have been behind the most recent release of Someone To Watch Over Me using Ella's original vocals accompanied by the LSO.
Producer: Maggie Ayre
www.bbc.co.uk/programmes/m001y7wy