for a song

基本解释

They bought that house for a song.
他們廉價地買下那幢房子。
《新英漢大辤典》
He knocked the artist down for a song.
他指名要求該藝術家唱一首歌。
But if anyone sees an opportunity to buy the entire firm for a song, they have yet to reveal themselves. Perhaps with good reason.
但如果有人認爲這是廉價購買整個公司的好機會的話，（雷曼公司內部人）可能早就以正儅的理由這樣做了。

The song is about leaving the big city for the countryside, going home again after a long time away.
It would appear that Milton's suggesting that it's chastity that actually establishes something like a precondition for hearing and learning that inspired song that's actually sung before the throne of God in Revelation.
那表明了彌爾頓的建議,關於確實是貞操建立了某些事物,像聽和學的事先準備對歌的啓發作用,在《啓示錄》裡確實在上帝麪前唱了。
耶魯公開課 - 彌爾頓課程節選
A listener hears the mournful feeling cowboys had for the prairie in this song called, "The Dying Cowboy."

And it struck me — boy, what a great title for a song, you know?
NPR: Bob Seger Changes His Tune About Detroit