"I've Been to a Marvellous Party" by Noël Coward, performed by Dame Patricia Routledge.

"I Went to a Marvellous Party" (sometimes known as "I've Been to a Marvellous Party") is a song with words and music by Noël Coward, written in 1938 and included in the revue, "Set to Music". Although a melody exists, the text is most often recited over a piano accompaniment. In my estimation, Dame Patricia Routledge's rendition is definitive. Please note that in British English, the word is commonly spelled "marvellous".