Question: Foster & McElroy have written songs for what English pop group, known for the song "Breakout"?

Context paragraphs:
Swing Out Sister: Swing Out Sister are an English pop group best known worldwide for the 1986 song "Breakout".  Other hits include "Surrender", "Twilight World", "Waiting Game" and a remake of the Eugene Record soul composition "Am I the Same Girl?"

Danny Foster (musician): Danny Foster (born 3 May 1979, Hackney, London) is an English pop/soul singer and television personality, who appeared in the inaugural series of the British television talent-show "Popstars", going on to become a founder member of the pop group Hear'say.

Breakout (Swing Out Sister album): Breakout is a compilation album by English pop group Swing Out Sister in 2001.  Although the album does feature many of the band's singles, it also includes album-only tracks and B-sides.

My World Fell Down: "My World Fell Down" is a song written by John Carter and Geoff Stephens, and first recorded by the English pop rock band the Ivy League, on Pye Records, in 1966 ("see" 1966 in music).  The song was covered a year later by the American sunshine pop group Sagittarius, and managed to chart on the "Billboard" Hot 100.  Sagittarius's version of the composition has remained highly sought after among record collectors for its close resemblance to the "Pet Sounds"-era Beach Boys.

Life, Love &amp; Pain: Life, Love & Pain is the debut album by contemporary R&B group Club Nouveau.  It was released in late 1986 with production by Denzil Foster, Thomas McElroy and Jay King.  The album reached number one on the Billboard Top Soul Albums chart and number six on the "Billboard" Pop Albums chart.  Led by the hit single, a cover of the Bill Withers classic "Lean on Me", which went to number one on both the R&B and Dance charts and number two on the pop chart, this was the only album that Denzil Foster and Thomas McElroy would contribute to, as the duo left the group to form its own production team and focus on working with other acts, notably En Vogue and Tony!  Toni!  Toné!

Foster &amp; McElroy: Denzil Foster and Thomas McElroy are an American R&B record production and songwriting duo, releasing recordings under the names Foster & McElroy and Fmob.  They have written and produced songs for musicians such as Club Nouveau, Tony!  Toni!  Toné! , Alexander O'Neal, Regina Belle, Madonna, and Swing Out Sister.  Their music has been sampled in hit songs by the Luniz, Puff Daddy, Ashanti, Jay-Z, Jennifer Lopez, LL Cool J, Jessica Simpson, and others.  Foster & McElroy are best known as the founders of the group En Vogue, listed by Billboard as one of the "Top 10 Girl Groups of All Time".  In addition to producing music for various television shows, they are also credited for songs in numerous movie soundtracks including "The Great White Hype", "Lean on Me", and "Who's That Girl".

Lies (En Vogue song): "Lies" is a song from American R&B/pop group En Vogue.  It is the second single from their debut hit album "Born to Sing".  Written and produced by Thomas McElroy and Denzil Foster, it became the group's second single to top the "Billboard" R&B singles chart.  The single peaked at number thirty-eight, it was also their second US "Billboard" Hot 100 top 40 hit.

Hong Kong English pop: Hong Kong English pop (Chinese: 英文歌) are English language songs that are made, performed and popularised in Hong Kong.  Known as simply English pop by Hong Kong people.  The height of the English pop era in Hong Kong was from the 1950s to mid 1970s.

Deja vu song: "Deja Vu" is a song by American R&B group En Vogue.  It was written by Denzil Foster, Thomas McElroy, Terry Ellis, Cindy Herron and Rhona Bennett; produced by Foster & McElroy and released on April 4, 2016.  The song is the group's first official single since its 2004 album, Soul Flower.

Tom Fletcher: Thomas "Tom" Michael Fletcher (born 17 July 1985) is an English singer-songwriter, guitarist, children's author and YouTube vlogger.  Among his accomplishments, he is one of the lead vocalists and guitarists of English pop rock band McFly, in addition to being the group's founder and principal songwriter.  He originally auditioned and was accepted into the band Busted before losing out on the place after the record label Island decided the band should be a trio rather than a four-piece.  However, he still carried on writing with the band and penned multiple of their hits alongside James Bourne.  In his thirteen-year career as a professional songwriter, Fletcher has penned ten UK number one singles and twenty-one top ten singles.  He is credited as having written songs for bands including One Direction, Busted, The Vamps and 5 Seconds of Summer.

Supporting paragraphs: Foster &amp; McElroy Swing Out Sister
Answer: Swing Out Sister