Lorde has teased the imminent arrival of new song ‘Mood Ring’, presumably the final single to be lifted from new album ‘Solar Power’ before it drops at the end of the week.The New Zealand pop singer revealed a release date of August 17 for the song via a post on her website. A music video co-directed by Lorde herself alongside Joel Kefali is also set to premiere at 7pm BST on August 17.