When assessing music, words like "independent" — and especially "indie" — get tossed around like so much confetti, often to describe works that aren't independent of anything. Particularly at this point in her many-hyphened career, Erin McKeown is a genuine independent: Her seventh album, Manifestra, is self-released, following a succession of detours and hairpin turns that have led her through folk, pop, rock, jazz standards and swing, along with many hybrids thereof.