Question: Which American singer and songwriter has a mezzo-soprano vocal range, Tim Armstrong or Tori Amos?

Context:
Tori Amos: Live from New York
Tori Amos: Live from New York is a benefit concert performed by American singer and songwriter Tori Amos on January 23, 1997.
 The concert was performed at the Madison Square Garden Theater in New York to launch "Unlock the Silence", a year-long promotional and fund-raising campaign sponsored by cK Calvin Klein to raise awareness of the work undertaken by RAINN, the Rape, Abuse and Incest National Network, a non-profit organization offering support and counseling to survivors of sexual assault.
 The performance included compositions from her first three albums, including "Silent All These Years" from her debut album "Little Earthquakes" (1992), which served as the touchstone track for the "Unlock the Silence" campaign.
Tim Armstrong
Timothy Ross “Tim” Armstrong (born on November 25, 1965) is an American musician, singer, songwriter, producer, and actor.
 He is best known as the singer/guitarist for the punk rock band Rancid and hip hop/punk rock supergroup the Transplants.
 Prior to forming Rancid, Armstrong was in the influential ska punk band Operation Ivy.
 In 1997, along with Brett Gurewitz of the band Bad Religion and owner of Epitaph Records, Armstrong founded Hellcat Records.
 In 2012, through his website, Armstrong started releasing music that influenced him, along with stripped-down cover songs of his own work under the name Tim Timebomb.
 He has released at least one song per week since late 2012.
 Armstrong is also a songwriter for other artists.
 Armstrong won a Grammy Award for his work with Jimmy Cliff and Pink and he has also worked with Joe Walsh.
Sarah McLachlan
Sarah Ann McLachlan, OC, OBC (born January 28, 1968) is a Canadian singer and songwriter.
 Known for her emotional ballads and mezzo-soprano vocal range, as of 2009, she had sold over 30 million albums worldwide.
 McLachlan's best-selling album to date is "Surfacing", for which she won two Grammy Awards (out of four nominations) and four Juno Awards.
 In addition to her personal artistic efforts, she founded the Lilith Fair tour, which showcased female musicians on an unprecedented scale.
 The Lilith Fair concert tours took place from 1997 to 1999, and resumed in the summer of 2010.
 On May 6, 2014, she released her first album of original music in four years, titled "Shine On".
Welcome to England
"Welcome to England" is a song by American singer and songwriter Tori Amos, appearing on the album "Abnormally Attracted to Sin" (2009).
 It was released as the lead digital single from the studio album on April 14, 2009 by Universal Motown Republic Group, which also marks as her first single released from the label.
 Written and produced by Amos herself, just like the rest of the album, the song was recorded at her husband's studio in England, Martian Studios.
Tales of a Librarian
Tales of a Librarian (complete title: "A Tori Amos Collection: Tales of a Librarian") is the first retrospective compilation album by singer/songwriter Tori Amos.
 Given the option to be involved in the project, Amos elected to take a central role in the production of the collection, released in 2003 on her former label Atlantic Records.
Tori Amos discography
Tori Amos is an American pianist and singer-songwriter whose musical career began in 1980, at the age of seventeen, when she and her brother co-wrote the song "Baltimore".
 The song was selected as the winning song in a contest for the Baltimore Orioles and was recorded and pressed locally as a 7" single.
 From 1984–89, Amos fronted the synthpop band Y Kant Tori Read, which released one self-titled album with Atlantic Records in 1988 before breaking up.
 Shortly thereafter, Amos began writing and recording material that would serve as the debut of her solo career.
 Still signed with Atlantic, and its UK counterpart East West, Amos' initial solo material was rejected by the label in 1990.
 Under the guidance of co-producers Eric Rosse, Davitt Sigerson and Ian Stanley, a second version of the album was created and accepted by the label the following year.
Datura (song)
"Dātura" or "Datura" is a song written and recorded by American singer Tori Amos.
 It is the ninth song of Amos's fifth record "To Venus and Back", which was released in September 1999.
 It is included in the first disc of the double album subtitled "Orbiting" that contains eleven original studio recordings.
 The song lists the names of the plants found in Amos's garden and was created during the recording sessions of "To Venus and Back".
 The song's title refers to datura, a plant known for its toxic and hallucinogenic properties.
 Amos has never performed the song live due to its complex structure and time signatures which makes it hard to reproduce with a live band.
 However, in 2011 Amos incorporated the "room in my heart" bridge when performing "Take to the Sky" during her concert in Brussels on October 29, 2011 Video on YouTube .
 She also performed the song in a similar fashion throughout the Unrepentant Geraldines Tour.
Putting the Damage On
"Putting The Damage On" is a ballad by American singer and songwriter Tori Amos, and is featured as the 17th track on her 1996 album, "Boys For Pele".
 The song may have been initially considered as a single for the album, because copies of the album were accompanied by a sticker listing this song, along with "Caught a Lite Sneeze" and "Talula," as feature songs, but of all five singles released from the album, "Putting the Damage On" was not one of them.
 In the song, Amos is accompanied by her own piano playing, and by the Black Dyke Band (which decades earlier had provided the brass band segments in The Beatles song Yellow Submarine).
Tori Amos
Tori Amos (born Myra Ellen Amos, August 22, 1963 ) is an American singer-songwriter, pianist and composer.
 She is a classically trained musician with a mezzo-soprano vocal range.
From the Choirgirl Hotel
From the Choirgirl Hotel is the fourth studio album by American singer and songwriter Tori Amos, released on May 5, 1998.
 A departure from her previous albums, it was more a heavily produced project featuring a full rock band sound (instead of Amos's usual minimalist piano sound).
 The album debuted at number 5 on the "Billboard" 200 and number 6 in the UK.
 While falling short of the number 2 debut for her previous album, "Boys for Pele" (1996), "From the Choirgirl Hotel" is Amos's strongest debut to date in US sales, selling 153,000 copies in the first week.
 In 1999, Amos received two Grammy nominations: Alternative Music Performance, and Female Rock Vocal Performance for "Raspberry Swirl".

Answer: Tori Amos