Saturday: noon Two Rivers, 6:30 p.m. Two Rivers; Sunday: 3:30 p.m. Railroad, 5 p.m. Two Rivers

Warner Williams is a songster and guitarist from the Washington, D.C., suburb of Gaithersburg, Md., and one of the finest Piedmont-style blues players in the country.

Piedmont blues, also known as East Coast or Tidewater blues, is a melodic, acoustic style. It is the oldest form of blues and derives from the black string bands of Colonial America.

Williams was born and raised in Takoma Park, Md., in a large family in which everyone played music. His father played fiddle, guitar and piano, and all of his eight brothers and three sisters played instruments and sang. Williams, who plays electric and acoustic guitar as well as the piano, recently retired from the Maryland National Capital Park and Planning Commission.

Like his Piedmont blues contemporaries, John Cephas and the late John Jackson, Williams was exposed to a wide variety of music in his formative years. He was influenced by bluesmen such as Lightnin’ Hopkins, Blind Boy Fuller and Muddy Waters, but he also listened to country and Western recording artists, including Gene Autry and Ernest Tubb. Blues, country, popular and novelty songs are all integral parts of Williams’ repertoire.

By the time Williams reached his teens, in the late 1940s, he was playing regularly around the D.C. area in a thriving street scene. Although he has never made a full-time living playing music, he has achieved a reputation as one of the area’s finest bluesmen.

Harmonica player Jay Summerour has been involved with music for more than 40 years. Beginning his musical education on the trumpet at age 7, Summerour learned the harmonica from his grandfather Smack Martin, a man remembered for playing “Delta blues, old blues … just anything that was music.” Largely self-taught, Summerour picked up bits and pieces from “folks he ran into,” folks such as Sonny Terry, James Cotton and Magic Dick.

During the late ’60s and early ’70s, Summerour took the traditional harmonica into the popular arena, joining the Starland Vocal Band and playing with the likes of Nils Lofgren and his band Grin. The Starland Vocal Band earned four gold records during Summerour’s tenure.

Williams and Summerour began playing together during the early ’90s, sometimes calling their duet Little Bit of Blues. They have been featured in concerts, on television and radio, and at festivals across the country, including appearances on the National Public Radio series “Folk Masters,” at the National Folk Festivals in Chattanooga, Tenn., and Lowell, Mass., and on the Washington Mall at the American Roots Fourth of July Celebration.