“I heard a big thing on NPR about the shrinking of the attention span and how now, with pop songs, everything has like six seconds before you gotta change it, because the kids swipe over,” Sheryl Crow tells the crowd early in her Tiny Desk Fest concert. “I’m just gonna tell you right now: We’re dinosaurs. … And while the kids are all writing fast food — which is super-cool ’cause it tastes great, super-filling — we’re sort of still writing salmon. We’re the songwriters that are here to tax your attention span.”