Parry was born in Newmarket (now known as Trelawnyd), Flintshire, in north-east Wales. Prior to his conversion to Mormonism, Parry was a Campbellite minister and was the leader of a church in Newmarket called "John Parry's Association", which was fashioned after the teachings of Alexander Campbell. In 1846, Parry and his wife Mary Williams were baptized by Mormon missionaries. About the Parrys, one commentator has stated that they were "in all likelihood the most distinguished of the Welsh to join the Church up to that time, and [their conversion] caused great excitement among other Welsh Mormons".[1]
At the October 1849 general conference of the LDS Church, Parry conducted 85 Welsh converts in singing several musical numbers. After the conference, church presidentBrigham Young invited Parry to formally organize a church choir that could provide music at future church conferences. Parry thus proceeded to organize what would later be called the Mormon Tabernacle Choir. Parry was the conductor of the choir until 1854, when he was succeeded by Stephen Goddard.[2][3]
Like many early Latter Day Saints, Parry practiced plural marriage. In 1851, he married Patty Bartlett Sessions, and over the next two years he would marry Grace Ann Williams—a sister of his deceased wife Mary—and Harriet Parry, one of his first cousins. Parry was the father of 12 children.