Laura Marling’s questing nature reaches its zenith on album four, the 16-song epic Once I Was an Eagle. It kicks off with a hypnotic four-track suite of songs tied together by a raga-like drone and hand percussion, sucking the listener into her existential headspace. Further in, there’s classical guitar (“Little Love Caster”), tender devotionals (“Love Be Brave”) and Dylan evocations (“It ain’t me, babe,” she affirms on “Master Hunter”), all stirred by her steely interrogations.