I recently wanted to find out the same thing myself - it seems this is a hard genre to name!
As far as I can tell, styles associated with the Andrews Sisters are:
I'm sure there must be a more specific name for there style though, one that's characterised by close harmonies, steel accompaniment (?), hawaiian slack key guitar...
The Andrews Sisters sang the version that was popular in WWII.
The first names of the Andrew Sisters are Laverne, Maxine and Patricia. The Andrew Sisters were a singing group that harmonized. Laverne sang contralto, Maxine sang soprano and Patricia sang mezzo-soprano.
I heard it was one of the Andrews Sisters. Which one, I don't know.
Julue Andrews and the children sang "Do Re Mi" in The Sound of Music. You can hear the song and get the lyrics at http://kids.niehs.nih.gov/lyrics/doremi.htm
The people who sang sisters were sisters, called Sis and Ters.
Their father was in the war so they decided to support him and everybody else that fought for their country and sang for them.
Georg and Maria Von Trapp played by Christopher Plummer and Julie Andrews.
I believe you mean the 1940s (WWII) and you're probably referring to the Andrews Sisters. Watch the Boogie Woogie Bugle Boy video to see if they are who you're talking about. Christina Aguilera recently sang a song based on that old hit (Candyman). Another good trio from the early half of the century was the Boswell Sisters (20s/30s). They have quite a few good songs.
The female singer known for her rendition of songs from "The Sound of Music" in the 1980s is Julie Andrews. She originally portrayed Maria in the iconic 1965 film adaptation of the musical. While Andrews continued to be associated with the film's music, many artists have performed its songs over the years, but she remains the most recognized voice from the original production.
Her younger sister Susie sang with her but Alice didn't
"Pearly Shells" was famously performed by Don Ho in the 1960s, but it was originally written by Jack Owens and was popularized in the 1950s by artists like Bing Crosby and The Andrews Sisters. The song has a Hawaiian theme and became associated with the Hawaiian music genre. Don Ho's rendition, however, is often the most recognized version.
Sam said, "Seven sisters spit spontaneously"