Somehow, Dinosaur Jr.’s unexpected reunion has made the indie-rock heroes stronger than ever.

The biggest development for “Give a Glimpse of What Yer Not” (Jagjaguwar) — the fourth album since the trio of singer-guitarist J. Mascis, singer-bassist Lou Barlow and drummer Murph rejoined forces in 2005 — is that Dinosaur Jr. sounds comfortable together again.

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Mascis’ mix of revved-up guitar and laid-back vocals on “Goin’ Down” shows how the band’s early work influenced current bands like Japandroids. The pop-tinged rock of “Tiny” could easily be a Foo Fighters hit until Mascis starts shredding halfway through. In fact, Mascis’ intricate guitar work has such a starring role on “Give a Glimpse” that the band used a compilation of all his solos on the album as promotion before its release. The grunginess of Mascis’ guitar and Barlow’s bass on “I Walk for Miles” shows why Dinosaur Jr. is now revered by generations of indie rockers.

However, it’s the new risks, like the way the gorgeous “Knocked Around” goes from a countrified Afghan Whigs beauty to a raging, punk-fueled romp, that make “Give a Glimpse” so special.