Lil’ Buck Sinegal, a guitarist whose mastery of zydeco and the blues made him a sought-after player heard on albums by Clifton Chenier, Buckwheat Zydeco, Allen Toussaint and more, died on June 10 at his home in Lafayette, La. He was 75.

His son, Paul Jr., said on Friday that the cause had yet to be determined but that a heart attack was suspected. His father, he said, was still playing until a few weeks ago despite substantial pain from a torn rotator cuff in his shoulder, and he had put off surgery so that he could play the New Orleans Jazz & Heritage Festival last month. The surgery was scheduled for June 17 — the day of his funeral.

In a career that began when he was a teenager, Mr. Sinegal, whose first and middle names at birth were Paul Alton, played on big stages around the world and in small clubs in southern Louisiana.

He was a regular at the Ponderosa Stomp, a New Orleans music festival dedicated to rediscovering unsung artists and songs of the past. Its website calls him “the best guitar slinger South Louisiana has to offer,” and in a tribute on Facebook, the festival’s co-founder, Ira Padnos, described him as “the heart and soul of the Ponderosa Stomp as well as its secret weapon,” a musician who would lead the festival’s backing band in hours’ worth of rehearsals to get the sound of the old roots-rock and blues tunes just right.