Best new songs: Mega Bog, Shirley Collins, Iron Maiden, Shannon Lay

Mega Bog describes her new video 'Maybe You Died' as “dark, leathered, supernatural, horny, evil" - that pretty much applies to the song as well; Britsh folk icon Shirley Collins shares the haunting 'Sailor Boy'; Iron Maiden are back in the saddle - 'The Writing on the Wall' is their first new song in six years and a return to form, accompanied by a mini-film; folk singer-songwriter Shannon Lay starts with a cappella 'Geist' to expand into a waltz called 'Awaken and Allow'.