WEST MILFORD Jay Ungar and Molly Mason, one of the most celebrated duos on the American acoustic music scene, will take the stage at Music at the Mission on Saturday, June 17, at 8 p.m. With renditions of Appalachian, Cajun and Celtic fiddle tunes, Civil War classics, songs from the golden age of swing and country, waltzes, and original compositions, Ungar and Mason embody the heart and soul of American roots music. The two grew up on opposite sides of the country. He was raised on pop music of the 1940s and 50s. She had a fondness for traditional fiddle music and 1930s and 40s popular tunes. He hung out in Greenwich Village coffeehouses and roamed North Carolina and Tennessee in search of traditional players. She played clubs and colleges on the West Coast and took a liking to the jazzy sound of the swing era. They met in the late 1970s at the Towne Crier in rural New York, hit it off musically and played together occasionally, until Mason headed off to Minnesota to work in the house band of Garrison Keillors “A Prairie Home Companion.” Meanwhile, back in New York, Ungar put together Fiddle Fever, and when the band needed a bassist, Mason signed on. In 1984 documentary filmmaker Ken Burns heard a recording of Ungar’s fiddle tune Ashokan Farewell. He was so taken with the melody that he wound up inviting Ungar and Mason to provide music for many of his projects. The selection of Ashokan Farewell as the main Theme of Burns landmark PBS documentary “The Civil War” resulted in an Emmy nomination for Ungar and a Grammy for the soundtrack album. Ungar and Mason further cemented their partnership when they married in 1991. The couple has appeared on “CBS Good Morning,” “All Things Considered,” “A Prairie Home Companion,” and the BBCs “Transatlantic Sessions,” a series of seven music specials. They continue to broadcast their own live-performance radio show, “Dancing on the Air,” heard on WAMC, Albany. Tickets are $19 and $21. Call 973-728-4201 or 1-800-613-1455.