Amy Lynn Hartzler (née Lee ; born December 13, 1981), known professionally as Amy Lee, is an American singer, songwriter, record producer and multi-instrumentalist.
 She is the co-founder and lead vocalist of the rock band Evanescence.
 Along with her contributions with the band, Lee has also participated on numerous other musical projects including Walt Disney Records' "Nightmare Revisited" and "".
 Lee has performed collaborations with artists such as Korn, Seether, and David Hodges.
 Lee is also the American chairperson for the international epilepsy awareness foundation "Out of the Shadows".
 During Evanescence's hiatus, Lee embarked on her film score career in 2013 by composing the soundtrack to "War Story" (2014) and "" (2015) with cellist Dave Eggar, and the song "Speak to Me" for the film "Voice from the Stone".
Of Mice & Men (often abbreviated OM&M) is an American metalcore band from Orange County, California.
 The band's lineup currently consists of lead vocalist and bassist Aaron Pauley, lead guitarist Phil Manansala, rhythm guitarist Alan Ashby, and drummer Valentino Arteaga.
 The group was founded by Austin Carlile and Jaxin Hall in mid-2009 after Carlile's departure from Attack Attack!
.
 Since 2009, the band has released four studio albums.
 Carlile departed from the band in December 2016 citing that a long term health condition prompted his exit.
 After Carlile's departure the band continue to pursue creating music with Pauley taking on both bassist and lead vocalist duties.
Melissa Ann VanFleet (born February 8, 1986) is an American singer/songwriter and musician from Bethlehem, Pennsylvania.
 She has toured internationally and appeared on the Full Metal Cruise II presented by Wacken Open Air in April 2015.
 She has garnered attention among the heavy metal music community for her acoustic piano version of American heavy metal band W.A.S.P.'s song "Sleeping (In The Fire)" on YouTube.
 Her vocals have been compared to Adele, Alanis Morissette and Amy Lee.
Tremonti is an American heavy metal band founded and fronted by lead vocalist and guitarist Mark Tremonti, best known as the guitarist of the American rock band Creed, and the lead guitarist of American rock band Alter Bridge.
 The band also consists of rhythm guitarist Eric Friedman and drummer Garrett Whitlock.
 Bassist Wolfgang Van Halen was in the band between 2012 to 2017.
 What originally started as a Mark Tremonti solo project evolved into a fully fledged band after the release of the group's first album, "All I Was", in July 2012.
 That album featured Tremonti himself playing guitar in addition to lead vocals, and the band was joined by Tremonti's Creed and Alter Bridge bandmate Brian Marshall playing bass on tour until his departure later that year.
 He was replaced by Van Halen bassist Wolfgang Van Halen, who contributed to the band's second album, "Cauterize", which was released on June 9, 2015.
 The band also has another album, entitled "Dust", in April 2016, serving as a continuation to "Cauterize".
Halford is an American heavy metal band formed in 1999 by British singer Rob Halford, who is best known as the lead vocalist for Judas Priest.
 Halford formed the band to return to his heavy metal roots.
 His two previous projects were a "street metal"-style band called Fight and the industrial metal band 2wo.
Machine Head is an American heavy metal band from Oakland, California.
 Formed on October 12, 1991, the group was founded by vocalist/guitarist Robb Flynn and bassist Adam Duce.
 The current lineup of the band comprises Flynn, drummer Dave McClain, guitarist Phil Demmel and bassist Jared MacEachern.
 Machine Head is one of the pioneering bands in the new wave of American heavy metal.
Pantera was an American heavy metal band from Arlington, Texas.
 The group was formed in 1981 by the Abbott brothers – drummer Vinnie Paul and guitarist Dimebag Darrell – along with lead vocalist Terry Glaze.
 Bassist Rex Brown joined the band the following year, replacing Tommy D. Bradford, who was the unofficial original.
 Having started as a glam metal band, Pantera released four albums during the 1980s.
 Looking for a new and heavier sound, Pantera replaced Glaze with Phil Anselmo in late 1986 and released "Power Metal" in 1988.
 With its fifth album, 1990's "Cowboys from Hell", Pantera introduced a groove metal sound.
 Pantera's sixth album, 1992's "Vulgar Display of Power", exhibited an even heavier sound. "
Far Beyond Driven" (1994) debuted at number one on the "Billboard" 200.
Ronny Munroe (born November 22, 1965) is an American heavy metal singer, most noted as the lead vocalist of the heavy metal band Metal Church from 2004 until the band broke up in 2009.
 His second tenure with the band lasted from 2012 when the group reunited until 2014, where he left to "pursue other interests".
 He also had a brief stint as the vocalist for Lillian Axe.
 He was also the lead singer of progressive rock band Presto Ballet.
 In October 2011 Munroe joined the Trans-Siberian Orchestra, as a vocalist.
Circle II Circle is an American heavy metal band from Tampa, Florida, United States.
 The band was formed by former Savatage lead vocalist, Zachary Stevens, and long-time friend and band manager Dan Campbell in 2001.
 They play varied genres of metal including; heavy metal, power metal and progressive metal.
Aaron Pauley (born August 4, 1988) is an American musician, singer, songwriter, and bassist born in Vacaville, California.
 He is most prominently known as the lead vocalist and bassist for the American heavy metal band Of Mice & Men.
 He formerly was the lead vocalist in the bands Jamie's Elsewhere and Razing Alexandria.

Question: Who is most prominently known as the lead vocalist and bassist for the American heavy metal band Of Mice & Men, Aaron Pauley or  Amy Lee?
Answer: Aaron Pauley