Haydn wrote over a hundred symphonies and around 40 of them have nicknames. This cassette that I picked up in dearly deaprted Woolies some years ago contains the philopsher, clock and military (22, 100 and 101). Haydn is quite acessible and good fun.
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.