NEW YORK — Dave Swarbrick, a fiddler who electrified the British folk tradition as a member of the band Fairport Convention, died Friday. He was 75.

His death was announced on his website. The announcement did not say where he died or specify the cause, but he had emphysema for many years.

Mr. Swarbrick and Fairport Convention were prime movers in trad-rock, which connected the 1960s ferment of folk-rock and psychedelia to a deep British heritage of storytelling ballads and nimble dance tunes. His fiddle-playing had the deliberately rough-hewed sound of rural tradition; his tone could be sweet or scratchy, his phrases songful and melancholy or propulsive and gnarled with ornamental turns and quavers.

He also sang, wrote songs and played viola, mandolin, mandola and guitar.

Mr. Swarbrick was born in New Malden, Surrey, near London, on April 5, 1941. He learned to play fiddle as a child in Yorkshire. In the 1950s, the pianist Beryl Marriott heard him in a skiffle band and invited him to join her traditional Gaelic band, beginning a long association.

By the early 1960s, Mr. Swarbrick was being heard on the BBC series “Radio Ballads,’’ a mixture of oral history and music produced by the songwriter Ewan MacColl; he also recorded with MacColl, Peggy Seeger, and other folk musicians.

He appeared on seven albums with the Ian Campbell Folk Group in the early 1960s, and in 1965 began recording with Martin Carthy, a leader of Britain’s folk revival. Mr. Swarbrick released his first solo album, “Rags, Reels and Airs,’’ in 1967.

Fairport Convention, which had started as a folk-rock group strongly influenced by American styles, brought in Mr. Swarbrick as a sideman on the 1969 album “Unhalfbricking.’’ The Fairport version of the traditional song “A Sailor’s Life’’ emerged as an 11-minute maelstrom, with Mr. Swarbrick’s fiddle rising alongside Richard Thompson’s lead guitar, bringing echoes of past generations into the jam.

For a pickup to amplify his instrument, Mr. Swarbrick recounted in the 2011 book “Electric Eden,’’ by Rob Young, “We smashed open a telephone and elastic-banded it to the fiddle.’’

Mr. Swarbrick switched to electric fiddle and joined Fairport Convention for its next album, “Liege & Lief,’’ also released in 1969. Merging rock instruments and riffs with traditional songs of love, war, and murder, the album became a cornerstone of trad-rock.

Fairport Convention’s lineup was perpetually unstable, and in the early 1970s Mr. Swarbrick took over more of the songwriting and lead singing. One of his major projects was Fairport’s 1971 concept album, “‘Babbacombe’ Lee,’’ about a Victorian convicted of murder who was freed after the gallows failed three times.

Mr. Swarbrick was also a studio sideman on many British folk-rock recordings, and he continued to play more traditional music in the band Three Desperate Mortgages.

The electric fiddle took a toll on Mr. Swarbrick’s hearing. By the end of the 1970s, he was nearly deaf in one ear. He officially left Fairport Convention in 1984.

A smoker since his teens, he struggled with failing health in the 1990s. He underwent three tracheotomies, and his emphysema grew so severe that at one point he needed oxygen onstage to perform.

A double lung transplant in 2004 improved his condition. He continued to make music, including a duo album with Carthy, “Straws in the Wind,’’ in 2006, and a final solo album, “Raison D’être’’ (2010), which gathered many of his collaborators through the decades.

Mr. Swarbrick leaves his wife, Jill Swarbrick-Banks; three children, Emily, Isobel, and Alexander; eight grandchildren; and two great-grandchildren. He lived in Coventry.

In a 2001 interview with the online music magazine Innerviews, Mr. Swarbrick said he long maintained the same goals: “To continue to be as expressive as I can and to not hold back, as well as not going over the top either. I would like to continue to expand my repertoire and do it all with integrity and the occasional whiskey.’’