The surprise album is so 2015. This time around, Wilco are dropping their tenth album the old-fashioned way: releasing one of its songs on the first anniversary of their last album, letting internet sleuths do some detective work, and giving you two months’ notice to prepare for its arrival. Indeed, last week’s “Locator” was an early tease of something larger, and that thing is Jeff Tweedy & Co.’s follow-up to last year’s Star Wars, titled — what else? — Schmilco, out September 9. As if that announcement alone wasn’t enough to send dads worldwide into a frenzy, it also comes with a new song. In the mood to revisit your repressed youth? Allow “If I Ever Was a Child” to be your therapy.