Photo: Courtesy of the Art Institute of Chicago, Helen Birch Bartlett Memorial Collection, 1926.253

© 2015 Estate of Pablo Picasso / Artists Rights Society (ARS), New York

Not to be confused, the color blue has it's own colorful significance. It can mean a clear sky or a deep sea (both an optical effect called the Rayleigh scattering). It's mostly everybody's favorite color when it comes to berries, moons, collars, and jeans.

Picasso and Jack White share an affinity for blue, as do all of the songs on this week's Retrofit. It's a playlist to envy, a bolt out of the blue.

Join us or turn blue. Retrofit: The Blue Period, Saturday, March 14 at 5 p.m. (Also available on Bluetooth.) 

Enjoy a playlist of "blue" songs below: