Question: What vocalist has a one-off single by Queensrÿche, with former guitarist known for his extensive vocal range, in particular his usage of falsetto?

Context paragraphs:
Aundrea Fimbres: Aundrea Aurora Fimbres (born June 29, 1983) is an American singer and dancer.  Fimbres was a member of the pop music group Danity Kane.  She is a soprano and was known for her melismatic vocal runs, and falsetto registered harmonies and also for having the highest vocal range of her fellow band members.

Voice type: A voice type is a particular human singing voice identified as having certain qualities or characteristics of vocal range, vocal weight, tessitura, vocal timbre, and vocal transition points ("passaggio"), such as breaks and lifts within the voice.  Other considerations are physical characteristics, speech level, scientific testing, and vocal register.  A singer's voice type is identified by a process known as voice classification, by which the human voice is evaluated and thereby designated into a particular voice type.  The discipline of voice classification developed within European classical music and is not generally applicable to other forms of singing.  Voice classification is often used within opera to associate possible roles with potential voices.  Several different voice classification systems are available to identify voice types, including the German "Fach" system and the choral music system among many others; no system is universally applied or accepted.

Roy Hart: Roy Hart, born Rubin Hartstein (30 October 1926 – 18 May 1975) was a South African actor and vocalist noted for his highly flexible voice and extensive vocal range that resulted from training in the extended vocal technique developed and taught by the German singing teacher Alfred Wolfsohn at the Alfred Wolfsohn Voice Research Centre in London between 1943 and 1962.

Discordia (song): "Discordia" is a one-off single by Queensrÿche vocalist Todd La Torre and former Megadeth/King Diamond guitarist Glen Drover, released in August 2014.  The song made the iTunes Top 100 Heavy Metal Songs upon its release.

King Diamond: Kim Bendix Petersen (born 14 June 1956), better known by his stage name King Diamond, is a Danish heavy metal musician.  As a vocalist, he is known for his extensive vocal range, in particular his usage of falsetto.  He is the lead vocalist for both Mercyful Fate and the eponymous King Diamond.

Adam Lopez: Adam Lopez Costa (born August 26, 1975), billed as Adam Lopez, is an Australian pop musician, vocal coach, and session vocalist.  He is noted for his ability to produce extremely high notes in his whistle register and for his extensive vocal range.  He is currently a Guinness World Record holder for singing the highest note (by a male) and a half step below the E in the 8th octave (E♭ ), or a tone and a semitone above the highest note on a standard 88-key piano.  He currently heads the vocal faculty at Sheldon College's Australian School of the Arts.

Carlotta Patti: Carlotta Patti (c. 1840 – 27 June 1889) was a nineteenth-century operatic soprano and sister to famed soprano Adelina Patti.  Various sources list her birth year as 1835, 1840, and 1842.  Born into a musical family, Patti studied the piano in her youth before following her younger sister's inclination toward singing.  As a child, Carlotta developed a handicap which caused a noticeable limp in her walk.  Due to this condition she mostly avoided operatic performances and preferred to sing on the concert stage.  While not able to achieve her sister's level of acclaim, Carlotta nonetheless received top billing in concerts in the United States of America, Great Britain, and Australia.  She was known for her extensive vocal range, reportedly being able to reach a G sharp in altissimo.  She often sang songs such as "Der Hölle Rache kocht in meinem Herzen" that highlighted this extensive range.  Carlotta Patti died of cancer in Paris on 27 June 1889.

List of basses in non-classical music: The bass singing voice has a vocal range that lies around the second E below middle C to the E above middle C (i.e., E–E).  As with the contralto singing voice being the rarest female voice type, the bass voice is the rarest for males, and has the lowest vocal range of all voice types.  However, the bass voice is determined not only by its vocal range, but also by its timbre, which tends to be darker than that of a baritone voice.

Georgia Brown (Brazilian singer): Georgia Brown, pseudonym of Rossana Monti (born June 29, 1980) is an Italian Brazilian singer noted for her extensive vocal range.  She was listed in the 2005 "Guinness World Records" for hitting the highest vocal note and for possessing the greatest vocal range for a female, claimed to be exactly eight octaves from G-G using scientific pitch notation.  However, as of 2013, Tim Storms holds the record for the widest vocal range of any human with 10 octaves.

Yuki Kaida: Yuki Kaida (甲斐田 ゆき , "Kaida Yuki" , born November 30 in Tokyo) is a Japanese voice actress.  Although she has an extensive vocal range, voicing a large variety of characters throughout her career, she is commonly typecasted as young males, achieving mainstream success as her roles in "Hunter × Hunter (1999)" as Kurapika, "The Prince of Tennis" as Shusuke Fuji, "Shōnen Onmyōji" as Abe no Masahiro.  and "Hetalia Axis Powers" and "Hetalia World Series" as China or Yao Wang.  She was formerly affiliated with the talent management agency Toritori Office, but is currently freelance.

Supporting paragraphs: Discordia (song) King Diamond
Answer: Todd La Torre