John Gerard McAvoy (born 19 December 1951) is a Northern Irish blues rock bass guitarist. He played with blues rock musician Rory Gallagher between 1970 and 1991, and then with Nine Below Zero until 2011.
McAvoy was born in Belfast, Northern Ireland on 19 December 1951. In his youth, he enjoyed listening to his sister's collection of Buddy Holly, Beatles and Rolling Stones records. Aged 13, he bought a second-hand Muddy Waters album in a Belfast record store and later said it "changed my life". He began playing in bands soon afterwards, initially on rhythm guitar before switching to bass.
He later joined the band Deep Joy, playing Motown and 60s pop covers. During his tenure in the band he first played with drummer Brendan O'Neill, who was later to tour with Rory Gallagher and appear on his last three albums Jinx, Defender and Fresh Evidence. Deep Joy eventually moved to London but split in late 1970, at the same time as Gallagher's band, Taste broke up. During their career, Deep Joy had played support slots to Taste. Gallagher contacted McAvoy, who had returned to Belfast, to come back and rehearse. The pair jammed with latterday Deep Joy drummer Wilgar Campbell, and the trio became Gallagher's first solo touring band.

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