A slew of changes has rocked Nate Cook’s world this past year. His band, The Yawpers — rock ’n’ roll with a country twinge, starring two acoustic guitars and a drum set — is letting their record deal with Boulder label Adventure Records expire, and the band has leapt over to Colorado SpokesBUZZ, becoming the first non-Fort Collins band to sign with the FoCo-based nonprofit/label.