Background: Johnny Young (born Johnny Benjamin de Jong; 12 March 1947) is a Dutch Australian singer, composer, record producer, disc jockey, television producer and host. Originally from the Netherlands, his family settled in Perth, Western Australia in the early 1950s. Young had a career in the 1960s as a pop singer and had a number one hit with the double-A-side, "Step Back" and "Cara-lyn" in 1966, and his profile was enhanced by a concurrent stint as host of the TV pop program The Go!!
Context: In 1970, Young formed a production company with Kevin Lewis (former Festival Records executive), Lewis-Young Productions, which developed the pop music television show Happening '70 - hosted by Wyllie - for the ATV-0 channel, it was subsequently followed by Happening '71 and Happening '72. Lewis-Young Productions also developed Young Talent Time from April 1971, a children's variety show and talent quest with Young as host. Regular cast members were known as the Young Talent Team, the show was a launching pad for several Australian performers including Jamie Redfern, Debra Byrne, Dannii Minogue and Tina Arena. The directors were Garry Dunstan and Terry Higgins. Each episode typically ended with Young and the team singing "All My Loving" as a lullaby. Young established the Johnny Young Talent School for performance arts in 1979, some of its students became contestants and regulars on Young Talent Time. 2004 Australian Idol runner-up Anthony Callea trained with the school, as did the 2008 winner, Wes Carr.  As well as producing the television series, Lewis-Young Productions distributed related merchandise including records on their own label (L&Y), books and magazines, a board game and a set of chewing gum cards. In 1972, Caravan Holiday, a short film, featured the original six Young Talent Team members plus two recently recruited new members, Greg Mills(later to be musical director in last years of YTT) and Julie Ryles (who died in early 2011) with cameos by pop star Johnny Farnham and long term judge Evie Hayes. Young was cast in multiple cameo roles as a service station attendant, farmer, speed boat attendant and camping park manager.  In 1989, Ten Network (formerly ATV-0), axed Young Talent Time quoting poor ratings against the popular variety series Hey Hey Its Saturday. Young had committed to building his own television studios to film Young Talent Time and was forced to sell his family home to finance the debts. During the year his stepfather died and, with his mother, he tracked down his biological father. Soon after his mother also died, and his marriage was in trouble. On 9 March 1990, Young was inducted into the TV Week Logie Awards' Hall of Fame for "an outstanding and sustained contribution to Australian television."  From 24 October 2006, weekly magazine New Idea featured articles on Byrne's autobiography, Not Quite Ripe, which alleged that from the age of 12 she was introduced to sex, drugs and alcohol on Young Talent Time. The claims were vigorously denied by Young, he stated that Byrne was already 14 when she started and that drugs were not available on set, "Any drug-taking Debra did, she certainly didn't do it on our show." He said no-one on the show was aware of her affair with "Michael", a boom operator ten years her senior. According to Byrne the pair had run off together for a weekend when she was 15. A producer for the show had "Michael" replaced as boom operator. Byrne also claimed that her parents knew of her relationship with "Michael".  In 2009, Young indicated that he was in talks with Network Ten to create an updated version of Young Talent Time. The new series aired on Network Ten from 22 January to 4 May 2012 and was hosted by Rob Mills, with Young serving as executive producer and judge.
Question: Did he discover any famous talent on the show?
Answer: the show was a launching pad for several Australian performers including Jamie Redfern, Debra Byrne, Dannii Minogue and Tina Arena.

Problem: Background: Stephen Arthur Stills (born January 3, 1945) is an American singer, songwriter, and multi-instrumentalist best known for his work with Buffalo Springfield and Crosby, Stills, Nash & Young. Beginning his professional career with Buffalo Springfield, he composed one of their few hits "For What It's Worth," which became one of the most recognizable songs of the 1960s. Other notable songs he contributed to the band were "Sit Down, I Think I Love You
Context: Stills, Furay, and Young reunited in Los Angeles and formed the core of Buffalo Springfield. Legend has it that Stills and Furay recognized Young's converted hearse on the streets of LA and flagged him down, a meeting described in a recent solo track "Round the Bend." The band would release three albums: Buffalo Springfield, Buffalo Springfield Again, and Last Time Around, and enjoy only one hit single, the Stills-penned "For What It's Worth" before disbanding. A Stills song from their debut album, "Sit Down, I Think I Love You," was a minor hit for the Mojo Men in 1967.  During the disintegration of Buffalo Springfield, Stills played on the Super Session album with Al Kooper and joined up with David Crosby, who had recently been ejected from the Byrds in the autumn of 1967. At a party in Laurel Canyon, Crosby was introduced to Graham Nash by a mutual friend, Cass Elliot (formerly of the Mamas and the Papas), and Nash found himself soon joining in singing with Crosby and Stills. Renditions of the latter's "You Don't Have to Cry," led to the formation of Crosby, Stills & Nash. Several of Stills's songs, including "Suite: Judy Blue Eyes" and "You Don't Have To Cry" on the debut album were inspired by his on-again-off-again relationship with singer Judy Collins. In a 1971 interview in Rolling Stone the interviewer noted, "so many of your songs seem to be about Judy Collins." Stills replied, "Well, there are three things men can do with women: love them, suffer for them, or turn them into literature. I've had my share of success and failure at all three."  The cover photo pictured on the debut was taken on the back porch of a house in West Hollywood, which was torn down the next day. Wanting to be able to tour and needing additional musicians, the band invited Neil Young to join them for their subsequent tour and second album to make the group the quartet Crosby Stills Nash & Young.  Having played at the Monterey Pop Festival with Buffalo Springfield, and both Woodstock and Altamont with CSNY, Stills performed at all three of the iconic U.S. rock festivals of the 1960s.
Question: did Stills know Nash before he worked with him?
Answer: