What is FOG? It's the reaction of the air when hot meets cold. It disrupts air traffic at SeaTac. It causes crashes on Interstate 5. It's the ooh-la-la factor of Adrienne Barbeau. Or maybe we're confusing it with Swamp Thing. Either way, there are good reasons for FOG, too. It lifts water out of the ocean, extracts the salt, then brings all that freshwater vapor to us at head level, just begging to be drunk. It's also four former members of the legendary jazz group Obrador: flutist Tom Russell, guitarist Paul Hjelm, bassist Steve Luceno and percussionist Michael Olson. Together, they bring more than 200 years of musical knowledge to the stage. Their music is rooted in jazz and folkloric styles and includes original compositions from their Obrador songbook. Be sure and turn your headlights on for FOG is coming.

FOG, 8 p.m., Rhythm & Rye, 311 Capitol Way N., Olympia, $5, 360.705.0760