Glenn Yarbrough, a folk singer who at midcentury found fame and fortune with the popular trio the Limeliters but who walked away from it all for a life at sea, died on Thursday at his daughter’s home in Nashville. He was 86.

The cause was complications of dementia, his daughter, Holly Yarbrough Burnett, said.

Founded in 1959, the Limeliters — comprising Mr. Yarbrough on vocals and guitar, Alex Hassilev on vocals and banjo and Lou Gottlieb on vocals and bass — was a contemporary folk group in the tradition of the Kingston Trio.

Known for their burnished tight harmonies, sophisticated if nontraditional arrangements and witty onstage banter, the Limeliters were wildly successful. Amid the folk revival of the 1960s, they appeared often on television and in live performance, sold records by the hundreds of thousands and became millionaires in the bargain.

By all critical accounts, Mr. Yarbrough’s silvery lyric tenor — a voice whose lightness belied his stocky appearance — was the group’s acoustic linchpin, soaring memorably in traditional tunes including “John Henry” and contemporary numbers like “Charlie, the Midnight Marauder,” about a hapless suburbanite who one night mistakenly enters the wrong house.