Problem: Late Night with Conan O'Brien is an American late-night talk show hosted by Conan O'Brien that aired 2,725 episodes on NBC between 1993 and 2009. The show featured varied comedic material, celebrity interviews, and musical and comedy performances. Late Night aired weeknights at 12:37 am Eastern/11:37 pm Central and 12:37 am Mountain in the United States.

The show's house band was The Max Weinberg 7, led by drummer Max Weinberg, who also served as a sounding board for O'Brien on the show (more so after Andy Richter's departure). The other six members were Mark Pender on trumpet, Richie "LaBamba" Rosenberg on trombone, Mike Merritt on bass, Jerry Vivino on saxophone and brother Jimmy Vivino on guitar, and Scott Healy on keyboards. James Wormworth served as backup drummer when Weinberg went on tour with Bruce Springsteen. With the departure of Andy Richter, Max Weinberg assumed a bigger role as an interlocutor for O'Brien's jokes. One common running gag was Max's awkwardness on camera and his apparent lack of chemistry with Conan. Weinberg was often used in sketches as well, which usually revolved around his purported sexual deviance (mostly a penchant for bedding barely legal groupies), although long-running sketches also spoofed Max's lack of knowledge of current affairs.  "LaBamba" was also used as the butt of many of Conan's jokes. These humorous sketches usually revolved around LaBamba's sizeable mustache, his poor acting skills, and his alleged inability to read written music. Mark Pender would often sing songs on the topic of a current event which ended with him screeching uncontrollably and climbing the risers into the audience. All members of the 7 had successful side careers as studio musicians.  As is common in the talk show format, the Max Weinberg 7 performed the show's opening and closing themes, played bumpers into and out of commercial breaks (they actually played through the entire break for the studio audience), and a short piece during O'Brien's crossover to his desk after his monologue (except for several months beginning in April 2008, where a commercial break was inserted at that point). The show's opening theme was written by Howard Shore and John Lurie (a finalist for the job as band leader). The show's closing theme was called "Cornell Knowledge", and was lifted from Jerry and Jimmy Vivino's first album together. However, on Late Night, it was played at a much quicker tempo than the album version.  The band played a wide variety of songs as bumpers--usually popular music from a variety of eras. Weinberg sometimes took extended leaves of absence to tour with Bruce Springsteen as the drummer for his E Street Band. During his absence, temporary replacement drummers were hired (most commonly James Wormworth), and the band was led by Jimmy Vivino ("Jimmy Vivino and the Max Weinberg 7").

When did they join the show?

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Problem: 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!!

After Young Talent Time, Young continued in entertainment, he worked as a radio disc jockey and occasionally performed live. In 1999 he produced Cavalcade of Stars for Foxtel including repackaging segments of Young Talent Time and showcasing new Australian bands.  In December 2000, Young relocated to Perth to become the breakfast host on Perth AM station 6IX. During 2001 to 2004, he periodically performed with Rowe, Buddy England (ex-The Seekers, The Mixtures) and Marcie Jones (Marcie and The Cookies) as the 'Legends of Sixties Rock' at venues across Australia - all four had appeared on The Go-Show. While living in Perth, Young established a new outlet for his Johnny Young Talent School franchise. In 2001, the 30th anniversary of Young Talent Time was celebrated by Network Ten with a special documentary, Young Talent Time Tells All, which was followed on 4 November by a reunion party for former cast members. Young attended with his daughter Anna - who had appeared on the show. Back in Perth, Young hosted The Pet Show on ABC Television in 2006.  On 27 October 2010, Johnny Young was inducted into the Australian Recording Industry Association (ARIA) Hall of Fame. On news of his impending induction Young said "I have always felt like the luckiest kid on the block to be able to continue working in the music industry for 50 years in so many areas when basically I am just a rock and roller. To receive this honour is the cherry on an amazing cake. I am very grateful to all those who supported and encouraged me." Young was inducted by Tina Arena, a former Young Talent Team member, who performed his song, "Here Comes the Star" as a musical tribute. Contemporary pop group, Short Stack performed Young's version of "Cara-Lyn"

where did he occasionally perform live?

Answer with quotes:
he periodically performed with Rowe, Buddy England (ex-The Seekers, The Mixtures) and Marcie Jones (Marcie and The Cookies) as the 'Legends of Sixties Rock' at venues