Musician-producer Lowell George, 34, who appeared in concert Thursday night at Lisner Auditorium, was pronounced dead Friday at 1 p.m. at Arlington Hospital after suffering chest pains at the Twin Bridges Marriott Hotel.

The cause of death was not immediately known, and an autopsy was scheduled for today by the Northern Virginia Medical Examiner's Office.

Mr. George was the founder and mainstay of the rock group Little Feat, which enjoyed a strong Washington audience and which was based here a few years ago. After seven albums, the group recently disbanded. In March Mr. George released a solo album on Warner Bros. called "Thanks, I'll Eat It Here."

In the two weeks before his death, Mr. George had performed 11 concerts in seven cities. He was scheduled to appear Friday night in Richmond.

Mr. George was born in Los Angeles. As a child he played harmonica, later adding flute, keyboards, guitar and slide guitar. After the disbanding of his first recording group, Factory, Mr. George worked as a back-up musician with such groups as the Mothers of Invention and the Standells.

Mr. George began producing albums for the GTOs, Grateful Deat, Valerie Carter and others, and in 1969 formed Little Feat. He listed among his musical influences Rahsaan Roland Kirk, Les McCann, Mose Allison and the Beach Boys.

Mr. George's marriage to Patty Price ended in divorce.

Survivors include his second wife, Elizabeth, and their daughter Inara, 4, of the home in Topanga Canyon, Calif., and two sons by his previous marriage, Forrest, 10 and Luke, 4.