In You Are My Sunshine, Robert Mann weaves together the birth of country music, Louisiana political history, World War II, and the American civil rights movement to produce a compelling biography of one of the world's most popular musical compositions. This is the story of a song that, despite its simple, sweet melody and lyrics, holds the weight of history within its chords.

The song's journey to global fame began in 1939, when two obscure "hillbilly" groups recorded it. By the century's end, it was a cultural phenomenon covered by hundreds of artists spanning every genre. It entered the Grammy Hall of Fame in 1999 and the Library of Congress's National Recording Registry in 2012.

At the center of this story is Jimmie Davis, who capitalized on his country music stardom to win two terms as Louisiana's governor. In 1940, Davis became the third artist to record "Sunshine," after he bought it and claimed it as his composition. The song became his anthem and a staple of his political rallies, radiating warmth and wholesomeness. Its sunny tune encouraged listeners to forget Davis's earlier recording career, marked by risqué blues recordings that clashed with the upright, gospel-singing image he later cultivated. As "You Are My Sunshine" grew in popularity, so did its link to Louisiana's "singing governor." In 1977, the Louisiana Legislature made it a state song.

In this biography, equal parts the story of Davis and the odyssey of his song, we discover that "Sunshine" shaped the early rise of country music but became tangled in Davis's pro-segregation policies, briefly overshadowing its legacy. You Are My Sunshine explores the song's contested origins, its rise to legendary status, and its ongoing resonance with millions. This is more than the story of a simple song; it's a biography of a cultural icon, enduring and ubiquitous as sunshine itself.