Question: What voice type does Sonny Bono's collaborator on the album Chér have?
Context: Sonny Bono Memorial Park is a park in Northwest Washington, D.C., at the intersection of New Hampshire Avenue, 20th Street, and O Street near Dupont Circle.  It is named for Sonny Bono.  The park was established in 1998, after Sonny Bono's death, by Bono family friend Geary Simon, a local real estate developer.  He approached the D.C. Department of Parks and Recreation's Park Partners program and paid $25,000 of his own money to revitalize an unused 800 sqft triangle of grass.  His improvements included installing an underground sprinkler system, planting new Kentucky bluegrass and a Japanese maple, as well as benches and a wrought-iron fence.  The park also features a vault of Sonny Bono memorabilia, such as the sheet music for "The Beat Goes On," his official Congressional cufflinks, and a mug from his string of Bono's Restaurants. American entertainer Cher has released 25 studio albums, nine compilation albums, three soundtrack albums, and one live album.  In 1964 Cher signed a recording contract with Imperial Records, a label owned by Liberty Records.  After the success of her first major single, Bob Dylan's "All I Really Want to Do" she and her then-husband Sonny Bono worked on her first album "All I Really Want to Do" released in 1965.  The album peaked at number sixteen on the "Billboard" 200 and at number seven on the UK Albums Chart.  After the massive success of "I Got You Babe" the record label encouraged her to record the second album, "The Sonny Side of Chér" (1966).  The record peaked within the top 30 in several countries. " Chér" (1966) and "With Love, Chér" (1967) were less successful on the music charts. " Backstage" and her first official compilation album "Cher's Golden Greats" (1968) her last efforts with Imperial were critically and commercially unsuccessful.  In 1969 Cher signed with Atco Records and released two albums: the critical acclaimed "3614 Jackson Highway" and her first soundtrack album "Chastity" for the film of the same name; both of them were a commercial failure. Chér is the eponymous third studio album by American singer-actress Cher, released on October 1966 by Imperial.  Cher collaborates again with Sonny Bono, with Harold Battiste and with Stan Ross.  The album is by-and-large a covers album and contains only one song written by Bono.  This album was a moderate commercial success, charted #59 on the "Billboard" Chart. "Bang Bang (My Baby Shot Me Down)" is the second single by American singer-actress Cher from her second album, "The Sonny Side of Chér".  Written by her then-husband Sonny Bono and released in 1966, the song reached No. 3 in the UK Singles Chart and No. 2 on the "Billboard" Hot 100 for a single week (behind "(You're My) Soul and Inspiration" by The Righteous Brothers), eventually becoming one of Cher's biggest-selling singles of the 1960s. "You Better Sit Down Kids'" is a major hit single release by American singer/actress Cher in 1967 from her fourth studio album "With Love, Chér", released on November 1967 by Imperial Records.  The song was written by her then-husband Sonny Bono.  Sung from a father's perspective, the lyrics tell the story of a divorce as explained to the couple's children.  The song is featured on the compilation albums "Cher's Golden Greats" (1968), "Superpack Vol.  1" (1972) and "Gold" (2005). The Sonny Side of Chér is the second studio album by American singer-actress Cher, released on April, 1966 by Imperial, as her second album, Cher again collaborated with Sonny Bono and Harold Battiste.  The album is by-and-large a covers album and contains two songs written by Bono.  The title of the album is a pun on the name of Cher's first husband Sonny Bono.  After its release, the album garnered positive reviews from critics.  The album was Cher's second successful album of the sixties. 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. Cher ( ; born Cherilyn Sarkisian; May 20, 1946) is an American singer and actress.  Sometimes referred to as the Goddess of Pop, she has been described as embodying female autonomy in a male-dominated industry.  She is known for her distinctive contralto singing voice and for having worked in numerous areas of entertainment, as well as adopting a variety of styles and appearances during her five-decade-long career. "Laugh at Me" was Sonny Bono's only hit song as a solo artist under the name Sonny.  The song was released in 1965 and reached #1 in Canada on the "RPM" national singles chart (to be knocked off the top spot the following week his own Sonny & Cher single, "Baby Don't Go").  It peaked at #10 in the U.S. and at #9 in the United Kingdom.  Thus, Sonny hit the Top 10 in all three countries as a solo artist before Cher.  The song was written and produced by Bono after he was refused entrance to Montoni's Restaurant in Hollywood because of his "hippie attire".  The song begins with Sonny saying, "I never thought I'd cut a record by myself but I got somethin' I wanna say.  I want to say it for Cher and I hope I say it for a lot of people." Chér (eventually reissued under the title Gypsys, Tramps & Thieves) is the seventh studio album by American singer-actress Cher, released in September 1971 by Kapp Records.  For this album, Cher left her husband Sonny Bono to produce the album, and for the first time she collaborated with Snuff Garrett and with Al Capps for the arrangements.  The album was retitled after the success of the single of the same name.  It received positive reviews from critics, and RIAA certified it Gold on July 2, 1972.  The album was her first and most successful album of the seventies.  Two singles were released from the album, "The Way of Love" and "Gypsys, Tramps & Thieves", both reaching the top 10 on the "Billboard" Hot 100 chart.
Answer: contralto