The argument has been made that a city’s vibrancy is directly correlated with the strength of its artistic community. Borrowing from this sentiment is DC51, a progressive artist collective based in the District. Recently, DC51 expanded its ranks to include not only visual artists but also musicians. In celebration of this growth, they’ll be holding a concert at the Rock and Roll Hotel tonight at 9 p.m. featuring several hip-hop influenced acts: Drop Electric,…