Question: We Need a Little Christmas was first performed by what British-American-Irish actress whose career has spanned seven decades?

Context paragraphs:
Jane Kean: Jane Kean (April 10, 1923 – November 26, 2013) was an American actress and singer, whose career in show business spanned seven decades and included appearing in nightclubs, on recordings, and in radio, television, Broadway and films.  Among her most famous roles were as Trixie Norton on "The Honeymooners" with Jackie Gleason, and as the voice of Belle in the perennial favorite "Mister Magoo's Christmas Carol".

Norris Houghton: Charles Norris Houghton (26 December 1909 – 9 October 2001) was a renowned theatre visionary whose career spanned seven decades.  Credited with over 50 theatre productions, he was stage manager, scenic designer, producer, director, theatre manager, academician, author, and public policy advocate: these myriad roles reflect his chosen life as a “generalist,” a multifaceted “theatre man.”  He is celebrated for accomplishments that reflect this span: as the premier American expert of 20th-century Russian Theatre; as a major force in creating the “off-Broadway” movement and inspiring live theater throughout the country; as a mentor to actors and innovators in world theatre; as an influential advocate of arts education; and as a student and educator of global theater chosen by prestigious foundations to study and report on theater across the U.S., Europe, and Asia.  His career culminated with his accomplishments as a distinguished scholar and teacher, selected to teach and promote theatre as part of a liberal education in such prominent universities as Princeton, Columbia, and Vassar; his academic career was completed at the State University of New York, where he helped create the SUNY Purchase campus and served as founding Dean of Theatre and Film.  A prolific author, this multifaceted life is documented in his books and articles, and his work has been the subject of analysis and commentary by admiring colleagues and reviewers in numerous articles, books, journals, and newspapers.  His books and papers are preserved for study in prestigious university and college library, archives, and rare book collections.

Angela Lansbury: Dame Angela Brigid Lansbury, {'1': ", '2': ", '3': ", '4': "} (born 16 October 1925) is a British-American-Irish actress who has appeared in theatre, television and film, as well as a producer, voice actress, singer, and songwriter.  Her career has spanned seven decades, much of it in the United States, and her work has attracted international attention.

Massimo Girotti: Massimo Girotti (18 May 1918 – 5 January 2003) was an Italian film actor whose career spanned seven decades.

We Need a Little Christmas: "We Need a Little Christmas" is a popular Christmas song originating from Jerry Herman's Broadway musical, "Mame", and first performed by Angela Lansbury in that 1966 production.

Emil Petaja: Emil Petaja (12 April 1915 – 17 August 2000) was an American science fiction and fantasy writer whose career spanned seven decades.  He was the author of 13 published novels, nearly 150 short stories, numerous poems, and a handful of books and articles on various subjects.  Though he wrote science fiction, fantasy, horror stories, detective fiction, and poetry, Petaja considered his work part of an older tradition of "weird fiction."  Petaja was also a small press publisher.  In 1995, he was named the first ever Author Emeritus by the Science Fiction Writers of America.

Jane Wyman: Jane Wyman (born Sarah Jane Mayfield; January 5, 1917 – September 10, 2007) was an American actress, singer, dancer and philanthropist whose career spanned seven decades.  She was also the first wife of 40th President of the United States Ronald Reagan; they married in 1940 and divorced in 1949.

Gladys Cooper: Dame Gladys Constance Cooper, DBE (18 December 1888 – 17 November 1971) was an English actress whose career spanned seven decades on stage, in films and on television.

Elisabeth Welch: Elisabeth Margaret Welch (February 27, 1904July 15, 2003) was an American singer, actress, and entertainer, whose career spanned seven decades.  Her best-known songs were "Stormy Weather", "Love for Sale" and "Far Away in Shanty Town".  She was American-born but was based in Britain for most of her career.

Stuart Holmes: Joseph Liebchen (March 10, 1884 in Chicago, Illinois – December 29, 1971 in Hollywood, California) (or born in Born in Schweidnitz, Germany) was an American actor and sculptor whose career spanned seven decades.  He appeared in almost 450 films between 1909 and 1964, sometimes credited as Stewart Holmes.

Supporting paragraphs: We Need a Little Christmas Angela Lansbury
Answer: Dame Angela Brigid Lansbury