This fine set of recordings appears to be part of a series from Cornell that, to date, has covered Alaska (1999), the Rocky Mountain states and provinces (1999; reviewed in W. Birds 31:64), and the lower Rio Grande Valley and southwestern Texas (2000). The compilation reviewed here contains vocalizations from 151 “Arizona species” (those with “at least one confirmed breeding record in the state”—although, apparently, a nest with two eggs of the Rufous-capped Warbler [Rosenberg and Witzeman 1999. W. Birds 30:94–120] does not qualify, and a further 51 “Sonora species,” including some that stray rarely to southeastern Arizona (e.g., the Plain-capped Starthroat and Yellow Grosbeak).