Question: If You Come Back was written by the lead vocalist of what boy band?

Context paragraphs:
Canadian Tour (Motley Crue Tour): The North American Tour was a concert tour by American heavy metal band Mötley Crüe.  The tour originally only had plans to run through Canada and was described as the band's biggest Canadian tour ever (18 shows) as their previous Canadian tours were up to 5 shows.  The opening act for most of the tour was Big Wreck.  On May 4, 2013 in Estevan, Saskatchewan, lead guitarist Mick Mars, who already suffers from Ankylosing spondylitis, got knocked down by a fan who was going after lead vocalist Vince Neil, causing the other band members to get upset towards the fan who was tackled to the ground on-stage by security, and even violent in bass guitarist Nikki Sixx's case as he kicked the fan while he was lying on the ground.  The band left the stage and announced to the audience that it was uncertain if they would return to finish the concert, but a few moments later they did however come back on-stage and play the remaining songs on their setlist.  Eleven dates in the U.S. were later added to the tour.

Love Is No Crime: Love Is No Crime is the third studio album of German band Bad Boys Blue.  It was released on 12 October 1987 by Coconut Records.  The album includes one international hit "Come Back And Stay".  Two singles were released from the record: "Come Back And Stay" and "Gimme Gimme Your Lovin' (Little Lady)".

First Invasion: "First Invasion" is the debut extended play by the South Korean boy band Infinite.  It was released on June 9, 2010.  They promoted the main single of the EP "Come Back Again" and followed with "She's Back".

Come Back to Me (Vanessa Hudgens song): "Come Back to Me" is the debut single by American actress and singer Vanessa Hudgens.  The song was written and produced by Antonina Armato and Tim James.  It was released on September 12, 2006, through Hollywood Records as the lead single from Hudgens' debut studio album, "V" (2006).  The song is built around a sample of "Baby Come Back" (1977) by American band Player.  Due to the inclusion of the sample, the original song's writers, Peter Beckett and J.C. Crowley, obtained writing credits.  Musically, "Come Back to Me" is a pop and R&B song with an urban beat, string instruments and hand claps.

Lee Brennan: Lee Anthony Brennan (born 27 September 1973) is an English singer, songwriter, dancer and actor.  He is the lead vocalist of boy band 911.

Come Back Mrs. Noah: Come Back Mrs. Noah is a British sitcom starring Mollie Sugden that aired on BBC1 from 17 July to 14 August 1978 with a pilot broadcast on 13 December 1977.  It was written by Jeremy Lloyd and David Croft, who had also written "Are You Being Served? " which also starred Mollie Sugden.  Joke banter was recycled from other series, and outrageously strange props were used.  "Come Back Mrs Noah" was not a success, with some regarding it as one of the worst British sitcoms ever made.

Into the Hot (Floy Joy album): Into the Hot is the debut album by English band Floy Joy.  It was released in 1984, and featured three singles: "Burn Down a Rhythm", "Until You Come Back to Me" and "Operator".  Both "Until You Come Back To Me" and "Operator" were minor hits in the UK.

Come Back (The J. Geils Band song): "Come Back" is a song written by Seth Justman and Peter Wolf that was first released by The J. Geils Band on their 1980 album "Love Stinks".  "Come Back" was the first single released from the album, and reached the US Top 40, peaking at #32 and remaining in the Top 40 for five weeks.  It peaked at #24 for three weeks in Canada.  It also made Billboard's Club Play Singles chart, peaking at #69.  The song remains in the rotation of classic rock radio stations.

BLAQ Style: BLAQ Style is the first full-length album by South Korean boy band MBLAQ, and was released by J.Tune Camp on January 10, 2011 at 11 AM KST.  MBLAQ's title songs will include "Stay" and "Cry".  A re-release of the album, retitled "BLAQ Style - 3D Edition", was released on February 22, 2011.  Consisting a total of 16 tracks, the album contains the 13 tracks from "BLAQ Style", as well as 3 new tracks.  Two of the three new tracks included MBLAQ's participation in its production.  The track "돌아올 수 없는 (Can't Come Back)" was composed by G.O and the lyrics were written by Mir, while the song titled "You" was written and composed by Cheon Doong.

If You Come Back: "If You Come Back" is a song by English boy band Blue, released as the third single from their debut studio album "All Rise" (2001).  It sold over 1 million singles worldwide.  It was written by Ray Ruffin, Nicole Formescu, Ian Hope, and Lee Brennan of boy band 911.  The song has received a silver sales status certification for sales of over 200,000 copies in the UK.

Supporting paragraphs: If You Come Back Lee Brennan
Answer: 911