Any time Baltimore crops up in conversation these days, thoughts are likely to turn to The Wire, but the gritty cop saga is far from its only artistic attraction. It’s not the biggest of American cities, but for many years Baltimore has harboured an indie rock underground whose tentacles have spread far and wide. First to make their mark were experimental pop troupe Animal Collective. Then Dan Deacon’s intense and playful compositions began to gain traction elsewhere. Beach House and Future Islands were next to transcend the city’s febrile scene, followed by indie-rock bands Wye Oak and Lower Dens and…