New Delhi, June 7 -- There has always been a place in pop music for a ghostly female vocalist. In the 1960s, it was the intimate ye-ye sound of Francoise Hardy; a decade later, Vashti Bunyan's underappreciated Just Another Diamond Day. And in the 1990s, there was the stately hush of the Cowboy Junkies' Margo Timmins and the aching haze of Mazzy Star frontwoman Hope Sandoval. To this august list we can now add Big Thief's guitarist-vocalist Adrianne Lenker, whose delicately frayed singing shades in complex colours on the band's third album, UFOF....