The word 'folk' used to refer to a type of music designed to be enjoyed by large groups of people. Old-fashioned folk songs aimed to create a feeling of community and togetherness, emphasising simple tunes and lyrics that everyone could join in with. Far more recently, 'folk' has come to denote a far lonelier sort of music: the word now gets thrown at acts like Bon Iver and Nick Drake and early-period Leonard Cohen. These days, 'folk' is one person with an acoustic guitar singing fragile, solitary-sounding songs to a room full of quiet, attentive listeners rather than to a choir of bawdy drunks in a crowded pub.
The Nightjar are a band from London who describe themselves as making "lo-fi post-folk" music. As the phrase 'post-folk' suggests, their sound is a step beyond that of the quivering, poetic mopes who commonly purport to be 'folk' musicians nowadays - not only is their particular twist on folk music not designed for consumption by large, loud groups of people, you almost get the sense that it's designed for a time when all other people have disappeared off the face of the Earth entirely.