The “Duetto buffo di due gatti” which is commonly attributed to Gioachino Rossini is often sung as a concert encore for two sopranos.
It is a delightfully humorous piece where only “meowing” is used in lieu of words.
Here are several versions popular on YouTube:
If she looks familiar it’s because she sung with FREDDIE MERCURY during the 1992 Summer Olympics in Barcelona!
A pioneering African American soprano – in this picture she is portraying Cleopatra. She was also featured in the BBC documentary, narrated by Dame Kiri Te Kanawa, “What Makes A Great Soprano?”
…finally, this wonderful rendition by a boy’s choir – I’m not sure if they’re French or Russian though.
Duetto buffo di due gatti by a boy’s choir >>> click the link