Thinking's important. It's good to know how.
And someday youll learn to, but someday's not now.
Go on to sleep now. You need your rest.
Don't think about thinking. it's not on the test.
CC had a link to this NPR broadcast clip (link here), but I dug a little deeper and found that the song has its own website, Notonthetest.com, with additional lyrics that include a stanza about the US education policy package called No Child Left Behind. The website is actually advocating for more art and other programs to stimulate creativity, which are being wedged out of education that targets test performance rather than knowledge.
The website also provides suggestions for parents on how to lobby for change, although education policy out here in the rest of the world might be far less susceptible to parental influence. Here, for example, the system is highly centralized with a rigid national curriculum that shackles students to test scores even though its leaders know it shouldn't (here's something I wrote recently about that unfortunate irony). Still, pressing for change is always better than just singing along.