THEY MIGHT BE GIANTS Join Us [Idlewild] Brooklyn indie-rock originators They Might Be Giants claim to once again be making music for adults, but when it comes to the “the two Johns”—founding frontmen and songwriters Flansburgh and Linnell—“grown-up” has always been a relative term. Were it not for a handful of PG-13 words and concepts, Join Us might appeal to young fans of Here Come the ABCs and Here Comes Science, two of four children’s...