Question: This poet was a mastery of the dramatic monologue who had art songs written to him by David Mills.

Context paragraphs:
Tithonus (poem): "Tithonus" is a poem by the Victorian poet Alfred, Lord Tennyson (1809–92), originally written in 1833 as "Tithon" and completed in 1859.  It first appeared in the February edition of the "Cornhill Magazine" in 1860.  Faced with old age, Tithonus, weary of his immortality, yearns for death.  The poem is a dramatic monologue with Tithonus addressing his consort Eos, the goddess of the dawn.

Robert Browning: Robert Browning (7 May 1812 – 12 December 1889) was an English poet and playwright whose mastery of the dramatic monologue made him one of the foremost Victorian poets.  His poems are known for their irony, characterization, dark humour, social commentary, historical settings, and challenging vocabulary and syntax.

Peter Robinson (New Zealand musician): Peter David Mills Robinson (24 August 1958 – 28 January 2016) was a New Zealand musician who played keyboards in The Tin Syndrome in the early 1980s.  He also played on recordings with Circus Block 4 and Violet Summer, and, under the alias David Mills, with Anthony McCarten's mid-1980s musical project "Anthony Takes A Bath".

Fra Lippo Lippi (poem): Fra Lippo Lippi is an 1855 dramatic monologue written by the Victorian poet Robert Browning which first appeared in his collection "Men and Women".  Throughout this poem, Browning depicts a 15th-century real-life painter, Filippo Lippi.  The poem asks the question whether art should be true to life or an idealized image of life.  The poem is written in blank verse, non-rhyming iambic pentameter.

Ai (poet): Ai Ogawa (October 21, 1947 – March 20, 2010), born as Florence Anthony, was an American poet and educator.  She won the 1999 National Book Award for Poetry for "Vice: New and Selected Poems".  Ai is known for her mastery of the dramatic monologue as a poetic form, as well as for taking on dark, controversial topics in her work.   About writing in the dramatic monologue form, she’s said: “I want to take the narrative ‘persona’ poem as far as I can, and I've never been one to do things in halves.  All the way or nothing.  I won't abandon that desire.”

Soft Eyes: "Soft Eyes" is the second episode of the fourth season of the HBO original series "The Wire".  Written by David Mills from a story by Ed Burns & David Mills, and directed by Christine Moore, it originally aired on September 17, 2006.

React Quotes: "React Quotes" is the fifth episode of the fifth season of the HBO original series, "The Wire".  The episode was written by David Mills from a story by David Simon & David Mills and was directed by Agnieszka Holland.  It first aired on February 3, 2008.

Natyachhatakar Diwakar: Shankar Kashinath Garge (शंकर काशीनाथ गर्गे) more popularly known as Natyachhatakar Diwakar (नाट्यछटाकार दिवाकर) (January 18, 1889 – October 1, 1931) was a Marathi writer whose mastery of the Natyachhata, a kind of dramatic monologue made him the only major Marathi writer to have used this literary form very successfully.  He was born in Pune, Maharashtra.

Dramatic monologue: Dramatic monologue, also known as a persona poem, is a type of poetry written in the form of a speech of an individual character.  M.H. Abrams notes the following three features of the "dramatic monologue" as it applies to poetry

David Mills (bass): David Mills (born 29 January 1929, Moose Jaw, Saskatchewan) is a Canadian bass singer, poet, composer and actor.  Retired now, he had an active international singing career that spanned more than five decades.  He has published two books of poetry, "Isobelle, a Novel in Verse" (Toronto 1989) and "The Social Comedy" (Ottawa 1990).  He wrote a one-man show, "David Mills - His Poetry and Songs", which premiered in Toronto in 1989 and then toured to numerous Canadian cities in the early 1990s.  As a composer he has written a cantata, "Vision of Peace" to texts from the Book of Isaiah, and several art songs to the poetry of Pauline Johnson and Robert Browning.  As an actor, he has appeared on CBC TV and in films for Circle Films and Altlantis Films among other production companies.

Supporting paragraphs: David Mills (bass) Robert Browning
Answer: Robert Browning