If they’d been born a generation earlier, Ira Kaplan and Georgia Hubley — the husband-and-wife core who founded Yo La Tengo in 1984 — might have worked in the Brill Building and earned a nice living writing hits for people who can actually sing. Fortunately, that didn’t happen, and instead they ended up composing their own great American songbook — a 14-album catalog (less compilations, EPs, etc.) that for all its stylistic wanderings has maintained…