Question: This Is Serious was an album by the singer who duetted with whom on the 1985 hit "Separate Lives"?
Context: Marilyn Martin (born May 4, 1954) is an American singer and songwriter.  She is best known for her 1985 hit duet with Phil Collins, "Separate Lives." Burlap & Satin is the now out-of-print 25th solo studio album by Dolly Parton.  Released on June 18, 1983, it straddled the line between pop and country sounds.  Consisting mostly of Parton's own compositions, two tracks were outtakes from the "Best Little Whorehouse in Texas" film: "A Cowboy's Ways" (a song intended for costar Burt Reynolds to perform in the film, that was ultimately cut out of the film) and "A Gamble Either Way".  The album's single, "Potential New Boyfriend" was a top twenty country single, and was accompanied by Parton's first ever music video.  Willie Nelson duetted on a cover of the Eddy Arnold hit "I Really Don't Want to Know. "It Didn't Matter" is a song by the English band The Style Council which was their fifteenth single to be released.  It was composed by lead singer Paul Weller, keyboardist Mick Talbot, and was released in 1987.  The song was duetted by Weller and his then-wife Dee C. Lee.  It is the first single from the band's third album, "The Cost of Loving", also known as the "Orange album".  Backed with "All Year Round", it became a hit, peaking at No. 9 in the UK, and No. 48 in both Australia, and New Zealand.  It has remained one of their most enduring hits. "Separate Lives" is a 1985 song recorded by Phil Collins and Marilyn Martin and featured on the soundtrack to the motion picture "White Nights".  It reached No. 1 in November, 1985 on the "Billboard" Hot 100 and Adult Contemporary charts as well as in Canada.  It reached No. 4 on the UK Singles Chart, and was certified silver by the British Phonographic Industry. White Nights: Original Motion Picture Soundtrack is the soundtrack for the 1985 film, "White Nights".  The most successful single on the album, "Separate Lives" by Phil Collins and Marilyn Martin, reached the top of the "Billboard" Hot 100 singles chart and was nominated for an Academy Award in 1986.  The prize instead went to Lionel Richie's "Say You, Say Me", another chart topper which appeared in the film but was not included on the soundtrack due to licensing issues. Ann Nesby (born Lula Ann Bennett; July 24, 1955) is an American R&B, gospel, and dance music singer and actress.  She is the former lead singer of Sounds of Blackness; a songwriter with credits including hits sung by Patti Labelle and Gladys Knight; plus she co-starred in the 2003 romance musical "The Fighting Temptations" with Cuba Gooding Jr. and Beyoncé Knowles.  Nesby had various appearances on the hit television series "American Idol".  In 2000, she duetted with Al Green on "Put It On Paper".  Nesby has been nominated four times since her departure from the Sounds of Blackness, most recently for her 2007 album "This Is Love"; plus the lead single "I Apologize" was nominated for a Grammy at the 2008 Grammy Awards. Nick Moroni (Remo Germani), a young singer called up, learns that his wife Catherine (Alicia Brandet) from which separate lives, is about to leave for America bringing with her the son born of their union; so he abducts the baby and takes him to the police station, charging the soldier Piscitello (Franco Franchi) to keep him well hidden.  The terrible sergeant Camilloni (Ciccio Ingrassia), discovers the child and is led to believe that he left him a woman with whom he had an affair in the past and, convinced that he is the father of the creature, asks Piscitello to keep he hidden from the eyes of all.  Piscitello naturally takes advantage of the situation to blackmail the sergeant, demanding concessions to no end and subjecting him to harassment of any kind ... This Is Serious is the second solo studio album by American singer Marilyn Martin.  Except for two tracks, the album was produced entirely by Jon Astley, who had also produced some of Martin's debut album.  Michael Verdick and Patrick Leonard produced "Possessive Love", and Terry Brown produced the album's closing track "Pretender". Messin' with the Boys is the second post-Runaways album by Cherie Currie, released in 1980 For this album Currie worked with her identical twin sister, Marie Currie.  Their band was called "Cherie and Marie Currie".  Marie was a guest vocalist on Cherie's first album, so Marie went on tour with Cherie to support her first album, "Beauty's Only Skin Deep".  When Marie would join Cherie on stage to sing the encores the audience would go wild.  So Cherie ran with the idea of two blonds are better than one.  The idea paid off because "Messin' with the Boys" received more radio play than "Beauty's Only Skin Deep", and their song "Since You Been Gone" made it to 95 on US charts.  The single "This Time" and the album Messin' with the Boys made the top 200 on U.S. charts.  This makes Messin' with the Boys Cherie Currie's most successful album.  "I Just Love the Feeling" originally surfaced on the 1974 album, "S.S. Fools" by the group of the same name.  Cherie duetted with that group's lead singer, Bobby Kimball, and wrote the additional lyrics in the second verse. Infamia or Torn Apart a story of love, hate, revenge and the desperation of those locked in its power struggles and haunted by the ghosts from the past.  Maria Julia Fernandez Vidal takes up the cause of good against evil, of light against darkness, of the will to live versus the wish to die, of honesty against deception.  Antonio, Maria Julia's husband and Jose Enrique her stepson and his wife Isabel all share the darkest secrets about Maria Julia –a woman who divides her time between her work, her love of gambling and a secret love.  Unaware that they are twins, Luz and Camila live two separate lives.  One lives in the big city whilst the other lives in Izamal a small provincial town and of course their lives are totally different but they are both victims of deceit and lies oblivious to who their real mother is.  Luz is a sensitive, kind, generous and responsible young lady with a clear objective in life: to study in order to be able to give abandoned children some hope for the future.  Camila, on the other hand was brought up quite differently.  Not shown enough love except by her nanny Paula.  Camila grew up to be a rather unstable young woman with a petulant and selfish nature.  The twins' lives take an unexpected turn as fate makes them both fall in love with Martin Sandoval a charming and ruggedly handsome tycoon.  Ambition, arrogance and beauty in the guise of a woman.
Answer: Phil Collins