Question: "Talkin' to the Moon" is a song written by an American singer who performed on how many Top 40 singles?
Context: Colleen Hewett (born 16 April 1950) is an Australian theatre and TV actress, and a popular singer.  Her top 40 singles on the Kent Music Report include "Super Star", "Day by Day" (both 1971), "Carry That Weight" (1972), "Dreaming My Dreams with You" (1980), and "Gigolo" (1981).  Her version of "Day by Day" peaked at No. 1 on the "Go-Set" National Top 40 Singles Chart and was certified as a gold record.  At the "TV Week" King of Pop Awards she was voted in both 1972 and 1973.  During 1985, she played Sheila Brady in the international hit TV series, "Prisoner". Finders Keepers is a song by You Me At Six which was released as a single on 25 May 2009.  The song was released on their Myspace account on 8 April.  A music video was released for the song on 22 April 2009.  It was later featured on the deluxe edition of their "Take Off Your Colours" album along with their next single, "Kiss and Tell", and three B-sides.  The song reached #1 in the Kerrang Rock Top 40, and peaked at #33 on the UK Singles Chart on the 31 May 2009.  This was their first and only entry to date in the Top 40 Singles Chart until "Rescue Me" in 2011. Hanson is an American pop rock band from Tulsa, Oklahoma, United States, formed by brothers Isaac (guitar, bass, piano, vocals), Taylor (keyboards, piano, guitar, drums, vocals) and Zac (drums, piano, guitar, vocals).  Supporting members include Dimitrius Collins (keyboards, guitar), and Andrew Perusi (bass) who have toured and performed live with the band since 2007.  They are best known for the 1997 hit song "MMMBop" from their debut album released through Mercury, Polygram, "Middle of Nowhere", which earned three Grammy nominations.  Despite the enormous commercial success of "Middle of Nowhere", the band suffered from the merger that eliminated their label, Mercury Records .  The group was moved to Island Def Jam Music Group, which they eventually left after a conflict with the label.  Hanson has sold over 16 million records worldwide and have had 8 top 40 albums and 6 top 40 singles in the US, as well as 8 top 40 singles in the UK.  The band now records under its own independent record label, 3CG Records. "Talkin' to the Moon" is a song written by Larry Gatlin, and recorded by American country music group Larry Gatlin & the Gatlin Brothers.  It was released in November 1986 as the second single from their album "Partners".  The song peaked at number 4 on the "Billboard" Hot Country Singles chart. American entertainer Cher has released seventy-nine official singles, fifteen promotional singles and appeared in eleven other songs.  On the "Billboard" Hot 100, she has achieved: 4 number 1 singles, 12 Top 10 singles, 22 Top 40 singles and a total of 33 charted singles as a solo artist, and combined with the entries she has had as part of a duo Sonny & Cher: 5 number 1 singles, 17 Top 10 singles, 32 Top 40 hits and a total of 51 singles which charted on the "Billboard" Hot 100. Taktika noja is the eighth album of the Croatian rock band Aerodrom, released through Menart Records in December 2012.  The album debuted at #23 on the official Croatian Top 40 chart and peaked at #13 in the next week.  Two new members performed on the record, guitarist Ivan Havidić (also performed on live album "Hitovi i legende") and drummer Damir Medić.  Seven singles were released from this album, "Loše volje", "Ostani", "Duh je nestao", which peaked at #8 on the national Top 20 singles chart, "Dovela si me u red", "Široko ti bilo polje", which debuted at #5 of the newly established national HR Top 40 singles chart, "Teška vibra", which debuted at #38 and peaked at #9 and "Mila Moja", which was released in May 2014 and peaked on Top 40 list at #14. Larry Wayne Gatlin (born May 2, 1948) is an American country and Southern gospel singer and songwriter.  As part of a trio with his younger brothers Steve and Rudy, he achieved considerable success within the country music genre, performing on thirty-three Top 40 singles (combining his solo recordings and those with his brothers).  As their fame grew, the band became known as Larry Gatlin & the Gatlin Brothers. American singer Aaliyah has released three studio albums, two compilation albums, and 26 singles.  She was born in Brooklyn, New York, and was raised in Detroit, Michigan.  At age 10, she appeared on "Star Search" and performed in concert alongside Gladys Knight.  At age 12, Aaliyah was signed to Jive Records and Blackground Records by her uncle, Barry Hankerson.  He introduced her to R. Kelly, who became her mentor, as well as lead songwriter and producer of her debut album. " Age Ain't Nothing but a Number" sold three million copies in the United States and was certified double Platinum by the Recording Industry Association of America (RIAA).  After facing allegations of an illegal marriage with Kelly, Aaliyah ended her contract with Jive and signed to Atlantic Records.  During her short career, Aaliyah earned 13 top 40 singles in the U.S. as well as 18 top 40 singles in the UK. Sir Elton Hercules John, (born Reginald Kenneth Dwight; 25 March 1947), is an English singer, pianist, and composer.  He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date.  In his five-decade career Elton John has sold more than 300million records, making him one of the best-selling music artists in the world.  He has more than fifty Top 40 hits, including seven consecutive No. 1 US albums, 58 "Billboard" Top 40 singles, 27 Top 10, four No. 2 and nine No. 1.  For 31 consecutive years (1970–2000) he had at least one song in the "Billboard" Hot 100.  His tribute single, re-penned in dedication to the late Princess Diana, "Candle in the Wind 1997" sold over 33million copies worldwide and is the best-selling single in the history of the UK and US singles charts.  He has also composed music, produced records, and has occasionally acted in films.  John owned Watford Football Club from 1976 to 1987, and 1997 to 2002.  He is an honorary Life President of the club, and in 2014 had a stand named after him at the club's home stadium. The discography of American recording artist Diana Ross, the former lead singer of The Supremes, consists of 25 studio albums and 91 singles.  27 of her singles reached the "Billboard" Top 40 in the US, 12 of them the "Billboard" Top 10, and six of those reaching number-one, placing her in a tie for fifth among the top female solo performers who have reached the top spot there.  In the UK, she amassed a total of 47 Top 40 singles with 20 of them reaching the Top 10 and two of those reaching number-one.  In the U.S., 17 albums reached the "Billboard" Top 40, four of those the Top 10, and one album topping the chart.  In the UK, 26 albums reached the Top 40, eight of those the Top Ten, and one album topping the chart.  Ross had a Top 10 UK hit in every one of the last five decades, and sang lead on a Top 75 hit single at least once every year from 1964 to 1996 in the UK, a period of 33 consecutive years and a record for any performer.  As of 2016 she continues to collect gold and silver awards for UK sales of her many greatest hits compilation albums.
Answer: thirty-three