Question: When was the R&B group founded that released a single contains a sample of the DeBarge song "A Dream"?

Context paragraphs:
In a Special Way: In a Special Way is the third studio album by American R&B group DeBarge, released by Gordy Records on September 24, 1983.  It was recorded at Kendun Records in Burbank and Westlake Audio in West Hollywood; written and produced by lead vocalist El DeBarge with additional writing by Mark, James and Bunny DeBarge.

Only You (112 song): "Only You" is the debut single from R&B group 112.  It is the lead single from their self-titled debut album.  Both the original and the remix were released as singles.  Q, Slim, and Mike share lead vocals on both versions of the song.  The original features The Notorious B.I.G., and the remix features both B.I.G. and Mase, and contains a bass sample of "Bounce, Rock, Skate, Roll" by Vaughan Mason & Crew, while the original contains a sample riff of "I Get Lifted" by George McCrae.

Knockin' Da Boots: "Knockin' da Boots" is the debut single from R&B group H-Town, taken from their debut album "Fever for da Flavor".  "Knockin' Da Boots" became one of the biggest R&B singles of 1993 according to the Billboard charts, where it peaked at number three for seven weeks, and also topped the R&B chart for four weeks, and it helped win the band a Soul Train Music Award for Best R&B/Soul or Rap New Artist.  Knockin' Da Boots, was originally titled, "Knockin the Tennis Shoes" and was co written by Eric Coutryer in 1992 before it debuted in 1993.  The song was certified platinum by the Recording Industry Association of America and sold over 1.1 million copies.  The song contains a sample of "Be Alright" by Zapp.

Drop (The Pharcyde song): "Drop" is a single by alternative hip hop group The Pharcyde, released in 1995 as the first single for the group's second album, "Labcabincalifornia".  The single contains a vocal sample of the Beastie Boys song "The New Style", using the titular "mmm... drop" line delivered during a drop to create its hook.

Bad Boys (DeBarge album): Bad Boys is the fifth studio album released by R&B group DeBarge in 1987, after both El DeBarge and Bunny DeBarge had left the lineup.

Blackstreet: Blackstreet, often stylized as BLACKstreet, is an American R&B group founded in 1991 by Teddy Riley and Chauncey Hannibal, also known as "C. Black".

9 Lives (AZ album): 9 Lives is the third studio album by rapper AZ, released under the Motown imprint.  The single "Problems" featured a sample from the DeBarge song "All This Love".  Although unable to match the success of his preceding albums, 9 Lives still managed to sell over 492,000 copies

A Dream (DeBarge song): "A Dream" is a song by DeBarge.  Written by Bunny DeBarge and produced by El DeBarge, the song is from their hit album "In a Special Way".  Although the track was not released as a single, the song has been popular over the years on R&B radio and has been sampled by several artists in the hip-hop and urban contemporary genres.

Don't Leave Me: "Don't Leave Me" is a single by R&B group Blackstreet, produced by Teddy Riley.  It contains a sample of the DeBarge song "A Dream".  It features Eric Williams, Mark Middleton, and Chauncey Hannibal on lead vocals.

Goodbye (Kristinia DeBarge song): "Goodbye" is the first single released by the American recording artist Kristinia DeBarge from her first studio album "Exposed".  It was released digitally in the United States on April 7, 2009, to US radio on April 28, 2009, and in the UK on August 10, 2009.  The song contains a sample of Steam's "Na Na Hey Hey Kiss Him Goodbye".  An uptempop dance pop track, the lyrics of the song deal with DeBarge getting over her ex-boyfriend.  A music video was released to promote the song, which features DeBarge and her friends stealing her ex-boyfriend's car and driving to various locations, including a house party.  Throughout the video, DeBarge is seen flirting with several men in an attempt to get back at her ex-boyfriend.

Supporting paragraphs: Don't Leave Me Blackstreet
Answer: 1991