Best new songs: Blu, Buffalo Nichols, The Ophelias...

Black Marble share an amusing song ‘Preocupation’ with a funny video; LA rapper Blu samples Beatles for a trippy song ‘Because the Sky Is Blu(e)’; The Ophelias share ‘Crocus’, a baroque-folk track with great strings; Generationals deliver some good indie-pop with ‘Mercy’; some great guitar work by folk-blues singer Buffalo Nichols on ‘How To Love’.