The problem with Celtic rock bands is that they frequently run it into the red, horse it in to the boat, jump the shark ... you get what I mean. The rock side in bands like the Dropkick Murphy's or Flogging Molly seems to predominate. Not so with Tempest, a world-wise ensemble based in Oakland, though it sports Norwegians, Cubans, and Americans in its line-up. Founded in 1988, the band immediately separated itself from the Celtic horde by infusing its music with traditional European folk and progressive rock. Though that may come across like a heavy brew, live, Tempest leans toward the music's timeless joy and drive.
Tempest celebrates 25 years of making music Thursday, April 12, at Lovin' Cup, 300 Park Point, 8 p.m., $10-$15, lovincup.com.