Billie Eilish has shared another update on the progress of her new material.The singer is currently at work on new music, having suggested earlier this week that as many as 16 songs are in contention to feature on her upcoming second album.Eilish’s latest in-the-studio update arrived overnight, with the singer posting an image of herself looking up at a screen showing a piece of music-making software in operation.Posting on Instagram, Eilish appeared to hint that whatever piece of new music – or