At Nats Park, Zac Brown's multiple musical personalities on display

Zac Brown brought his band to Nationals Park on Friday in support of his fourth CD, "Jekyll + Hyde," an attempt to see how far the country fans who gave him his career will let him stray into other styles of music. The success of that disc and this tour indicates that Brown can get away with playing whatever the heck he wants: The record and some songs from it have topped various album and singles charts, and the packed D.C. gig followed a three-night stand at Boston's Fenway Park.