Supercalifragilisticexpialidocious

For many years I've been told about learning English by songs and how it doesn't help at all. Firstly, there are a lot of songs with mistakes (e.g. "Sometimes I think what I need is a you intervention", '4 Minutes', 2008). Secondly, there are not a lot of singers/actors like Julie Andrews in this world. I've watched all of her movies and understood every word she said. Unfortunately, Julie Andews' movie career is not that long and it's divided into two uneven parts:

1) "Mary Poppins" ("Supercalifragilisticexpialidocious", "Feed the Birds", etc/) and "Sound of Music" ("My Favourite Things", "Do-Re-Mi", etc.) and "VIctor/Victoria" ("Crazy World", "Tamarind Seed", "Shady Dame from Seville", etc.).
2). Other musicals, decent Blake Edward's films and drama films with music ("Star", and put "Duet for One" in that category too).
3). "Princess' Diaries", other Blake Edward's films and television films she made in the 80s and 90s before or after the loss of her singing voice.

I've downloaded all of her albums on iTunes (even "Lass With a Delicate Hair" and 80's supermarket staff with different names for the same albums). I can only wonder why she wasn't writing songs for herself like other Brits usually do. Mancini and other classical composers are great, but why didn't Andrew Lloyd Weber ever write for her? She wasn't tremendously busy in the 70s and 80s releasing one movie in 3-5 years and home made albums with "Two for Tea" and other 20s-50s songs.

P.S Will someone please tell me why Russian filmmaker Michalkov uses shots of Julie Andrew's face from "Star" movie in his terrible flick "Barber of Siberia" (1998). Was he obsessed with her and now hiding? Because gays are usually obsessed with Julie Andrews as Rupert Everett made known in his tell-all book.