The instrumental album Stratosfear was first released in 1976. It followed Ricochet (also a great album). It is by the German group Tangerine Dream. Critics say it marks the beginning of the band's development away from their uncompromising early '70s synthesizer experiments towards something more melodic. It certainly must mark the band at its height with the classic line-up of Froese, Baumann and Franke doing their last album together. Critics also say it combines the band's acoustic and electronic influences more tightly than before. They instance, the deep piano/flute tune at the end of the last track, "Invisible Limits". The LP reached No.39 in the UK, in a 4-week chart run, and eventually reached silver status for selling in excess of 60,000 copies. Great cover. I owned the album but parted with my first copy as a joint birthday present for a school friend, the man who is now Bishop of St Asaph. (If someone has a google search on that phrase may be it will pick up. Hi Greg.)
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.