When Gary Oelze bought a small restaurant in South Arlington called the Birchmere in 1966, the only sound he cared about was the scrape of knives and forks against plates.... But when nearby residents started moving farther out — to places like Woodbridge and Dale City — the crowd thinned. Advertisement Oelze — who had played in bands as a teen — thought music might draw people in.... And he noticed a certain type of music was especially popular then at bars around the city: bluegrass....