In a sign of things to come, Isaac Brock, frontman of the quirky pop-rock band Modest Mouse, Friday’s next the last act at the Voodoo Music + Arts Experience, greeted his audience by saying, “It’s nice to be here. I wish it was raining on you.”

Rain is predicted for Saturday and Sunday, but opening day of Voodoo Experience in City Park in City Park was blessedly dry and pleasant. So Brock did not get his wish.

Brock and Modest Mouse’s set at Voodoo’s Altar Stage was an often driving, furious yet eccentrically grooving affair. A bit sloppy and unwieldy but fun. Brock played electric guitars and a banjo. He sang jagged, percussive lyrics that were almost raps. A stage full of musicians, many of them multi-instrumentalists, accompanied him. Two drummers and two horn players game the music extra punch.

At one point in the show, Brock seemed to turn to his band and say he had no idea what they were going to do next. They thought of something, and such a statement from curmudgeon Brock fit the show’s chaotic, off-the-cuff energy.