Indie rock may be bankable now, but old codgers (aka people in their 30s) will tell you that the glory days are 15 years in the rearview mirror, back when Pavement, Superchunk and the Archers of Loaf ruled college radio. “Wild Mountain Nation” is a throwback to those times, when distorted guitars and a palpable amount of slack were enough to carry a band. But Blitzen Trapper ups the ante. Gone are the painfully lo-fi aesthetic and the too-cool-to-practice approach; in its place is a self-released stunner that sounds like Pavement’s “Wowee Zowee” polished and shined for a new millennium. Fuzz-rock, punk and twang coexist peacefully, and the title track is a picture-perfect three minutes that proves indie rock isn’t dead, it’s just all grown up.