Question: This Is Serious is the second solo studio album by a singer best known for what 1985 duet?

Context paragraphs:
Wisin: Juan Luis Morera Luna (born December 19, 1978), best known as his stage name Wisin, is a Puerto Rican reggaeton recording artist and record producer, best known as a member of the reggaeton duo Wisin & Yandel.  He released his first solo album "El Sobreviviente" in 2004, and ten years later, in 2014, his second solo studio album, "El Regreso del Sobreviviente" was released.  Wisin is currently working with Prince Royce on their "Power and Love" tour.

Revival Tour: The Revival Tour was the second solo concert tour by Selena Gomez, in support of her second solo studio album "Revival" (2015).  The tour began in Las Vegas, Nevada at the Mandalay Bay Events Center on May 6, 2016, and concluded in Auckland, New Zealand at the Vector Arena on August 13, 2016.

Breakaway (Art Garfunkel album): Breakaway is the second solo studio album by Art Garfunkel.  It was released in 1975 on Columbia Records.  It was produced by Richard Perry who has produced albums for other artists such as Carly Simon.  It includes three Top 40 singles: "I Only Have Eyes for You" (US #18, UK #1), "Break Away" (US #39) and the Simon And Garfunkel reunion duet, "My Little Town" which peaked at #9.  "I Only Have Eyes For You" is noted also for being Garfunkel's first #1 single in the UK.  "Breakaway" has proven to be Garfunkel's most successful solo album; although only peaking at number 9 in the United States, which was lower than his first album "Angel Clare" (US #5), it has been certified platinum by RIAA.

This Is Serious: 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".

Special Delivery (Dottie West album): Special Delivery is the twenty second solo studio album by American country artist, Dottie West.  The album was released in 1979 on Liberty Records and was produced by Randy Goodrum and Brent Maher.  The album came on the heels of two chart-topping West duet albums with Kenny Rogers and reestablished West as a major solo artist, becoming West's most successful solo album since 1967 thanks in part to three top 15 country hits on the collection, including "A Lesson in Leavin'", the first solo number one record in West's 20-year career.

Oldschool (Nena album): Oldschool is the seventeenth studio album by German recording artist Nena.  Having received some negative publicity at the time of the release of her previous album "Du bist gut" for refusing in interviews to talk about the 1980s, Nena chose to celebrate the past with her next studio album.  The first single released from the album, "Lieder von früher" ("Songs from the Past"), enthuses about the pleasure of dancing to old records, and the title track (not to be confused with "Oldschool, Baby", Nena's 2002 duet with WestBam) happily reflects on Nena's being best known for a few songs from the 1980s.  The album was produced by the Hamburg hip-hop artist and rapper Samy Deluxe and features a duet with Nena’s eldest surviving son, Sakias.  Although published on Nena's own record label, The Laugh and Peas Company, distribution rights were agreed with Sony Music, 22 years after the company dropped Nena as a recording artist following the indifferent performance of her second solo album "Bongo Girl".

Ms. Kelly: Ms. Kelly is the second solo studio album by American recording artist Kelly Rowland.  It was released on June 20, 2007 through Columbia Records in collaboration with Music World Entertainment.  Originally titled "My Story" and expected for a mid-2006 release, the album marked Rowland's first solo studio album in four years.  Retitled and delayed numerous times prior to its official release, the album's release date was eventually moved to 2007 in favor of a multi-tiered marketing strategy and additional recording sessions.  Willed to produce a more personal effort after her debut studio album "Simply Deep" (2002), Rowland contributed nine tracks to the reworked "Ms. Kelly", which took her solo work further into urban music markets, involving production by Scott Storch, Polow da Don, Soulshock & Karlin and singer Tank, among others.

Marilyn Martin: 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."

Freddie Gibbs discography: The discography of Freddie Gibbs, an American rapper, consists of three solo studio albums, one collaborative studio album, thirteen singles, nine extended plays, nine mixtapes and one compilation album.  In 2013, Freddie Gibbs released his debut studio album "ESGN".  This was followed by the collaborative album "Piñata" with producer Madlib in 2014.  The following year, Gibbs released his second solo album and third album overall, "Shadow of a Doubt".  His most recent studio release is "You Only Live 2wice", his fourth album overall.

Sin Fronteras (Dulce María album): Sin Fronteras (English: ‘Without Borders‘) is the second solo studio album by Mexican singer-songwriter Dulce María.  It was released on digital retailers on April 8, 2014 via Universal Music Latin.  "Different, energetic and passionate" are the words with which Dulce Maria described her second solo album.

Supporting paragraphs: This Is Serious Marilyn Martin
Answer: Separate Lives