Question:
Yankovic was born in Downey, California and raised in Lynwood, California. He is the only child of Mary Elizabeth (Vivalda) and Nick Yankovic. His father was born in Kansas City, Kansas, of Yugoslavian descent, and began living in California after serving during World War II; he believed "the key to success" was "doing for a living whatever makes you happy" and often reminded his son of this philosophy. Nick married Mary in 1949.
Yankovic is well known for creating parodies of contemporary radio hits, typically which make up about half of his studio releases. Unlike other parody artists such as Allan Sherman, Yankovic and his band strive to keep the backing music in his parodies the same as the original, transcribing the original song by ear and re-recording the song for the parody. In some cases, in requesting the original band to allow for his parody, the band will offer to help out with the recreation: Dire Straits members Mark Knopfler and Guy Fletcher perform on "Money for Nothing/Beverly Hillbillies*", Yankovic's parody of Dire Straits' "Money for Nothing", while Imagine Dragons provided Yankovic with advice on how to recreate some of the electronic sounds they used for "Radioactive" in Yankovic's parody "Inactive". Yankovic's career in novelty and comedy music has outlasted many of his "mainstream" parody targets, such as Toni Basil, MC Hammer, and Men Without Hats. Yankovic's continued success (including the top 10 single "White & Nerdy" and album Straight Outta Lynwood in 2006) has enabled him to escape the one-hit wonder stigma often associated with novelty music.  Although many of Yankovic's songs are parodies of contemporary radio hits, it is rare that the song's primary topic lampoons the original artist as a person, or the song itself. Most Yankovic songs consist of the original song's music, with a separate, unrelated set of amusing lyrics. Yankovic's humor normally lies more in creating unexpected incongruity between an artist's image and the topic of the song, contrasting the style of the song with its content (such as the songs "Amish Paradise", "White & Nerdy", and "You're Pitiful"), or in pointing out trends or works which have become pop culture cliches (such as "eBay" and "Don't Download This Song"). Yankovic's parodies are often satirical of popular culture, including television (see The TV Album), movies ("The Saga Begins"), and food (see The Food Album). Yankovic claims he has no intention of writing "serious" music. In his reasoning, "There's enough people that do unfunny music. I'll leave the serious stuff to Paris Hilton and Kevin Federline."  Yankovic considered that his first true satirical song was "Smells Like Nirvana", which references unintelligible lyrics in Nirvana's "Smells Like Teen Spirit". Other satirical songs include "Achy Breaky Song", which refers to the song "Achy Breaky Heart", "(This Song's Just) Six Words Long", which refers to the repetitious lyrics in "Got My Mind Set on You", and "Perform This Way", set to Lady Gaga's "Born This Way" that drew inspiration from Lady Gaga's outlandish but confident attitude.  Yankovic is the sole writer for all his songs and, for "legal and personal reasons", does not accept parody submissions or ideas from fans. There exists, however, one exception to this rule: Madonna was reportedly talking with a friend and happened to wonder aloud when Yankovic was going to turn her "Like a Virgin" into "Like a Surgeon". Madonna's friend was a mutual friend of Yankovic's manager, Jay Levey, and eventually Yankovic himself heard the story from Levey.
Answer this question using a quote from the text above:

Why does he enjoy doing parodies?

Answer:
In his reasoning, "There's enough people that do unfunny music. I'll leave the serious stuff to Paris Hilton and Kevin Federline."

Answer the question at the end by quoting:

Stanley Kirk Burrell (born March 30, 1962), better known by his stage name MC Hammer (or simply Hammer), is an American hip hop recording artist, dancer, record producer and entrepreneur. He had his greatest commercial success and popularity from the late 1980s, until the early 1990s. Remembered for his rapid rise to fame, Hammer is known for hit records (such as "U Can't Touch This" and "2 Legit 2 Quit"), flashy dance movements, choreography and eponymous Hammer pants. A multi-award winner, M.C. Hammer is considered a "forefather/pioneer" and innovator of pop rap (incorporating elements of freestyle music), and is the first hip hop artist to achieve diamond status for an album.
Before Hammer's successful music career (with his mainstream popularity lasting approximately between 1988 and 1998) and his "rags-to-riches-to-rags-and-back saga", Burrell formed a Christian rap music group with CCM's Jon Gibson (or "J.G.") called Holy Ghost Boys. Some songs produced were called "Word" and "B-Boy Chill". "The Wall", featuring Burrell (it was originally within the lyrics of this song he first identified himself as K.B. and then eventually M.C. Hammer once it was produced), was later released on Gibson's album Change of Heart (1988). This was Contemporary Christian music's first rap hit ever. Burrell also produced "Son of the King" at that time, releasing it on his debut album. "Son of the King" showed up on Hammer's debut album Feel My Power (1987), as well as the re-released version Let's Get It Started (1988).  With exception to later remixes of early releases, Hammer produced and recorded many rap songs that were never made public, yet are now available on the Internet. Via his record labels such as Bust It Records, Oaktown Records and FullBlast, Hammer has introduced, signed and produced new talent including Oaktown's 3.5.7, Ho Frat Hoo!, the vocal quintet Special Generation, Analise, James Greer, One Cause One Effect, B Angie B, The Stooge Playaz, DASIT (as seen on ego trip's The (White) Rapper Show), Teabag, Common Unity, Geeman and Pleasure Ellis; both collaborating with him and producing music of their own during his career.  At about the age of 12, Oakland native Keyshia Cole recorded with Hammer and sought career advice from him.

How long did he stay with them?