Generate a detailed and concise text with a simple straightfoward language focusing on the topics i will give you about music_artist Olivia Newton-John . I'm looking for a straightforward and non-flowery style in this article with minimal use of adjectives. Please use simple and easily understandable language throughout the article. Please avoid unnecessary repetition of dates and times in your responses unless they are directly relevant to the context. This is used for a middle part in our script. Cut out intro and outro and jump right into the given facts. Using the information provided, craft a narrative or response that begins with a general statement or an engaging opening sentence: 
1: Olivia Newton-John as Sandy in ['Grease']. When Dame Olivia Newton-John was cast as Sandy, her character's background had to be changed to accommodate Newton-John's background. In the original Broadway musical, Sandy was an all-American girl and her last name was Dumbrowski. In the movie version, she became Sandy Olsson from Australia. John Farrar , Newton-John's frequent songwriter, wrote two new songs for this movie while other songs from the Broadway musical were dropped.
2: Shortly after the success of Grease (1978), was considered for the lead role in a film version of "Evita" (one of many versions that were scrapped before seeing the light of day). She had recorded "Don't Cry for Me Argentina" on her album "Making a Good Thing Better" (1977).
3: Olivia Newton-John as Sandy in ['Grease']. The New York Times critic Vincent Canby liked this movie. He said it was "a contemporary fantasy about a 1950s teenage musical - a larger, funnier, wittier, and more imaginative-than-Hollywood movie with a life all its own." Regarding the two leads, he said " Olivia Newton-John , the recording star in her American film debut, is simultaneously very funny and utterly charming as the film's ingenue, a demure, virginal Sandra Dee -type. She possesses true screen presence, as well as a sweet, sure singing voice." and " John Travolta , as Miss Newton-John's co-star, a not so malevolent gang-leader, is better than he was in Saturday Night Fever ." He called the love duet performed by Newton-John and Travolta at the finale "a breathless new number". He also said "'Grease' stands outside the traditions it mimics. Its sensibility is not tied to the past, but to a free-wheeling, well informed, high-spirited present."


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        Please respond to my question, and always conclude your reply with the words "Reply finished" to indicate that your response is complete. 
        Make sure the reply is fully contained before these words and is not cut off prematurely. Thank you.}
         Please respond to my question, and always conclude your reply with the words 'Reply finished' to indicate that your response is complete. Ensure that the text is fully formed without any placeholders such as '[Conclusion]' or '[Placeholder]'. Make sure the reply is fully contained before these words and is not cut off prematurely. Thank you.