Yes, Zac Brown is indeed the lead singer of the Zac Brown band.
Crossover definition, a bridge or other structure for crossing over a river, highway, etc. See more.
: a series of absurd moments straight outta crossover hell; Bridging some gap of medium, ''lifestyle,'' etc: They created a lesbian comedy that is likely to be a crossover hit (1990s+) noun. A shift from one musical style to another or a deliberate mixture of disparate styles (1970s+ Musicians)