In 'Singin' in the Rain', who performs the title song dance in the rain?

In 'Thelma & Louise', which actresses play the title characters? In 'The Sound of Music', what is the family's surname? In 'The Sound of Music', which actor plays Captain von Trapp? In 'My Fair Lady' (1964), who plays Eliza Doolittle? In 'Grease', who plays Sandy? In 'Grease', what is the name of Danny's gang? In 'West Side Story', what are the two rival gangs? In 'The Outsiders' (1983), what are the two rival groups?