Continental seventies rockstars seem to be falling like flies at present. German Edgar Froese was not widely covered but Greek star Demis Roussos was. I have very little Roussos in my collection but this opening title track from Aphrodite's Child (yes that's Vangelis on keyboards and before Demis got fat and wore khaftans) is a great track. It's power to induce nostalgia (a Greek word after all that really refers to homesickness) is powerful. I like particulalry the way it really does seem to be 5 pm (in winter) when I listen to it.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.