Answer the question at the end by quoting:

Mercury was born Farrokh Bulsara (Gujarati: phaarokh blsaaraa, Pharokh Balsara) in Stone Town in the British protectorate of the Sultanate of Zanzibar, East Africa (now part of Tanzania) on 5 September 1946. His parents, Bomi (1908-2003) and Jer Bulsara (1922-2016), were Parsis from the Gujarat region of the then-province of Bombay Presidency in British India. As Parsis, Mercury and his family practised the Zoroastrian religion. The Bulsara family had moved to Zanzibar so that his father could continue his job as a cashier at the British Colonial Office.
Although Mercury's speaking voice naturally fell in the baritone range, he delivered most songs in the tenor range. His known vocal range extended from bass low F (F2) to soprano high F (F6). He could belt up to tenor high F (F5). Biographer David Bret described his voice as "escalating within a few bars from a deep, throaty rock-growl to tender, vibrant tenor, then on to a high-pitched, perfect coloratura, pure and crystalline in the upper reaches." Spanish soprano Montserrat Caballe, with whom Mercury recorded an album, expressed her opinion that "the difference between Freddie and almost all the other rock stars was that he was selling the voice". She adds, His technique was astonishing. No problem of tempo, he sang with an incisive sense of rhythm, his vocal placement was very good and he was able to glide effortlessly from a register to another. He also had a great musicality. His phrasing was subtle, delicate and sweet or energetic and slamming. He was able to find the right colouring or expressive nuance for each word. The Who lead singer Roger Daltrey called Mercury "the best virtuoso rock 'n' roll singer of all time. He could sing anything in any style. He could change his style from line to line and, God, that's an art. And he was brilliant at it." A research team undertook a study in 2016 to understand the appeal behind Mercury's voice. Led by Professor Christian Herbst, the team identified his notably faster vibrato and use of subharmonics as unique characteristics of Mercury's voice, particularly in comparison to opera singers, and confirmed a vocal range from F#2 to G5 (just over 3 octaves) but were unable to confirm claims of a 4-octave range. The research team studied vocal samples from 23 commercially available Queen recordings, his solo work, and a series of interviews of the late artist. They also used an endoscopic video camera to study a rock singer brought in to imitate Mercury's singing voice.

what was he like as a singer?

His technique was astonishing. No problem of tempo, he sang with an incisive sense of rhythm,

Answer the question at the end by quoting:

Michael John Kells Fleetwood was born in Redruth, second child to John Joseph Kells Fleetwood and Bridget Maureen (nee Brereton) Fleetwood. His elder sister Susan Fleetwood, who died of cancer in 1995, became an actress. In early childhood Fleetwood and his family followed his father, a Royal Air Force fighter pilot, to Egypt. After about six years, they moved to Norway where his father was posted on a NATO deployment.
Fleetwood also led a number of side projects. 1981's The Visitor produced by Richard Dashut, featured heavy African stylistics and a rerecording of "Rattlesnake Shake" with Peter Green. The song "You weren't in love" was a hit in Brazil because of the Soap-opera Brilliant. In 1983 he formed Mick Fleetwood's Zoo and recorded I'm Not Me. The album featured a minor hit, "I Want You Back", and a cover version of the Beach Boys' "Angel Come Home". A later version of the group featured Bekka Bramlett on vocals and recorded 1991's Shaking the Cage. Fleetwood released Something Big in 2004 with The Mick Fleetwood Band, and his most recent album is Blue Again!, appearing in October 2008 with the Mick Fleetwood Blues Band touring to support it, interspersed with the Unleashed tour of Fleetwood Mac. He has played drums on many of his bandmates' solo records, including Law and Order, where he played on the album's biggest hit, Trouble. Other albums include French Kiss, Three Hearts, The Wild Heart, Christine McVie, Try Me, Under the Skin, Gift of Screws, and In Your Dreams. In 2007 he was featured on drums for the song "God" along with Jack's Mannequin in the Pop album Instant Karma: The Amnesty International Campaign to Save Darfur, a collection of covers of John Lennon songs. In literature, Fleetwood co-authored Fleetwood - My Life and Adventures with Fleetwood Mac with writer Stephen Davis, published by William Morrow & Co. in 1990. In the book he candidly discussed his experiences with other musicians including Eric Clapton, members of The Rolling Stones, Led Zeppelin, as well as the affair with Stevie Nicks and his addiction to cocaine and his personal bankruptcy. Reception was mixed. Robert Waddell of the New York Times described the piece as "a blithe, slapdash memoir." The Los Angeles Times's Steve Hochman noted that "Fleetwood tells the story as if he was sitting in your living room, which is good for the intimacy of the tale, but bad for the rambling, sometimes redundant telling." Hochman did acknowledge that Fleetwood was "one of rock's more colorful characters." Fleetwood has a secondary career as a TV and film actor, usually in minor parts. His roles in this field have included a resistance leader in The Running Man and as a guest alien in the Star Trek: The Next Generation episode "Manhunt". Fleetwood co-hosted the 1989 BRIT Awards, which contained numerous gaffes and flubbed lines. In the wake of this public mishap, the BRIT Awards were pre-recorded for the next 18 years until 2007; the awards are now again broadcast live to the British public. Fleetwood and his third wife, Lynn, had twin daughters (Ruby and Tessa) who were born in 2002 he also became a U.S. citizen on 22 November. Fleetwood filed for divorce from Lynn in 2013.

Who did he co-author the book with?
writer Stephen Davis,