a poetical response following close observation: pebbles for rivers of stones
Should I know the song? This has made me think.
Believe me, I'm doing you a favour by not putting it into your head!
I finally worked it out. Fortunately Max Bygrqaves isn't the first thing to come into my head, even when I see pink and blue (and indeed when you give me a complete line of the song as the title!) I'm just lucky, I guess. :)
Ah ... I'd not remembered Max B ... and didn't want to.