Julie Andrews About Her Youth (AFI, 2022)
THANK YOU, Archive Chum!
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It's part of Julie's AFI Life Achievement Award Ceremony, originally filmed in February 2020, according to a Twitter post back then. (Director: Chris Merrill/ Camera: Fred Elmes)

The music they have used in this bit can be found here:
- Come To The Fair (1948)    • Come To The Fair (1948) - Julie Andre...  
- “Je Suis Titania” - Polonaise from Mignon (1947)    • “Je Suis Titania” Polonaise from Mign...  
- at the Royal Command Performance at the London Palladium (1948)    • Julie Andrews at the Royal Command Pe...  

Find the other parts here:
Julie on Broadway    • Julie Andrews - Broadway Years (AFI, ...  
Julie's Hollywood Career, Pt 1:    • Julie Andrews - Hollywood Career, Par...  
(not yet released! Julie's Hollywood Career, Pt 2:    • Julie Andrews - Hollywood Career Part...   )