By KELLY CROW CONNECT Enlarge Image Close EACH SPRING, Maharaja Gaj Singh II hosts a Sufi music festival inside his family’s vast desert fort in the Indian city of Jodhpur. From a distance, this monumental sandstone fortress, called Mehrangarh, looms over the city’s chalky blue buildings, evoking the country’s ancient and otherworldly history. And yet people fly in from across the globe because the festival—and the maharaja who hosts it—blends old India so deftly with new. On the festival’s opening night this year, thousands of visitors filed into the fort’s crenellated stone courtyard—once reserved for royal wives—to cheer on Rabbi Shergill, a Punjabi rocker whose black turban matches his…