Welch was born in Los Angeles, California, into a show business family. Welch's father was movie producer and screenwriter Robert L. Welch, who worked at Paramount Pictures in the 1940s and 1950s, producing films starring Paramount's top box office stars, Bob Hope and Bing Crosby (solo, not as a duo). He also worked as a TV producer, responsible for the 25th Annual Academy Awards TV special in 1953 and The Thin Man TV series in 1958-59. Bob's mother, Templeton Fox, had been a singer and actress who worked with Orson Welles' Mercury Theatre in Chicago, Illinois and appeared on TV and in movies from 1962 to 1979.

Welch struggled with a variety of marginal bands until 1971, when he was invited to join Fleetwood Mac, a British blues band that had lost two of its three front-line members, Peter Green and Jeremy Spencer, within a few months, and which was moving away from the blues genre. Along with fellow newcomer Christine McVie, a keyboardist/singer-songwriter (formerly of the British blues band Chicken Shack, and newly married to Fleetwood Mac founding bassist John McVie), Welch helped to steer the band in a more melodic direction, particularly after lead guitarist/singer-songwriter Danny Kirwan was fired from the band in 1972 after an argument with Welch. In the summer of 1971, the remaining members of Fleetwood Mac held auditions at their retreat in England, Kiln House, while seeking a guitarist to replace Spencer. Judy Wong, a friend of the band who served at times as their secretary (Kirwan's song "Jewel-Eyed Judy" was dedicated to her), recommended her high school friend Welch to the band. Welch (who has sometimes been described as Wong's high school boyfriend) was living in Paris at the time. The band had a few meetings with Welch and decided to hire him without actually playing with him or listening to any of his recordings. Welch was given the role of rhythm guitar, backing up lead guitarist Kirwan. It was felt that having an American in the band might extend Fleetwood Mac's appeal in the States. Welch eventually went to live in the band's communal home, a mansion called Benifold, which was located in Hampshire. Using mobile equipment borrowed from The Rolling Stones, the band recorded material for three albums at Benifold: Bare Trees, Penguin and Mystery to Me. The band's first album to feature Welch and McVie, Future Games, was recorded, however, at Advision Studios in London (as is cited on the back of the album jacket) and Bare Trees was mostly recorded at De Lane Lea Studios in Wembley. In September 1971, the band released Future Games, with the title song written by Welch. This album was different from anything the band had done up to that point. In 1972, six months after the release of Future Games, the band released Bare Trees, which featured Welch's song "Sentimental Lady". The song went on to become a much bigger hit for him five years later when he re-recorded it for his solo album French Kiss. Christine McVie also sang on the remake and was a producer of the song. CANNOTANSWER

Answer the following question by taking a quote from the article: What was his role with Fleetwood Mac?

Welch helped to steer the band in a more melodic direction, particularly after lead guitarist/singer-songwriter Danny Kirwan was fired