As a team, though, they are naturals: his libretto poetically concise, her setting of it flowingly dramatic, with generous, singer-friendly melodies and an ear for the musicality of language on the level of syllables and words.

Source: https://www.nytimes.com/2023/06/14/arts/music/el-ultimo-sueno-san-francisco-opera.html

She wrote the music and libretto for “Omar” alone on her banjo.

Source: https://www.sandiegouniontribune.com/entertainment/music/story/2023-11-05/rhiannon-giddens-soars-with-pulitzer-win-she-is-one-of-the-greatest-artists-in-the-world-says-pat-metheny

“We knew we had only a year and a half, so we immediately went to work,” recalled Michael Cristofer, who wrote the libretto.

Source: https://www.independent.co.uk/news/ap-met-metropolitan-opera-new-york-spanish-b2315499.html