The crossword solutions for the term BMO Singer Lennox are ARI, which stands for Ariana Grande. Ariana Grande is an American singer, songwriter, and actress. She began her career in 2008 in the Broadway musical 13, before playing the role of Cat Valentine in the Nickelodeon television series Victorious and in the spinoff Sam & Cat. In 2013, she released her debut studio album Yours Truly, which debuted at number one on the US Billboard 200. Since then, she has released five studio albums, with her most recent being Positions in 2020. She has also won numerous awards, including five Grammy Awards.