Unavoidable Staircase of Memory

I'm a slowpoke, slow on the trigger, what are the other clichés for slow reaction time? Oh, yes, Diderot's staircase, L'esprit de l'escalier. But that's not quite that.

I read about an intriguing idea,  it catches my attention, and when I finally realize its depth some days or weeks later, I've already  lost the source of my read and forgotten all the thoughts behind the idea. Like the idea expressed by a musician, or music historian or ?, in an interview published by a San Francisco newspaper once (but when?), that a musical composition should be heard only once. Or, more recently, a book review in the Wall Street Journal (what book?) where the author, or the reviewer (which?) refers to music as an "unavoidable art".  Here at least I happen to remember the reasoning behind it, but as always there was more. All irretrievably lost.

You tell me that Google knows everything?  Well, let it locate the source of these two ideas!