Irish singer/song writer Lisa Hannigan spent most of her early career in the shadow of Damien Rice as his right hand lady. Following their calamitous falling out, she set off on her own and has since released two exceptional albums: Sea Sew (2009 ATO Records) and Passenger (2011 ATO Records). The third tack from Passenger, Knots (3:42), is an excellently crafted song, wrought …