In 1964, Simone changed record distributors from Colpix, an American company, to the Dutch Philips Records, which meant a change in the content of her recordings. She had always included songs in her repertoire that drew on her African-American heritage, such as "Brown Baby" by Oscar Brown and "Zungo" by Michael Olatunji on her album "Nina at the Village Gate" in 1962. On her debut album for Philips, "Nina Simone in Concert" (1964), for the first time she addressed racial inequality in the United States in the song "Mississippi Goddam". This was her response to the June 12, 1963, murder of Medgar Evers and the September 15, 1963, bombing of the 16th Street Baptist Church in Birmingham, Alabama, that killed four young black girls and partly blinded a fifth. She said that the song was "like throwing ten bullets back at them", becoming one of many other protest songs written by Simone. The song was released as a single, and it was boycotted in some southern states. Promotional copies were smashed by a Carolina radio station and returned to Philips. She later recalled how "Mississippi Goddam" was her "first civil rights song" and that the song came to her "in a rush of fury, hatred and determination". The song challenged the belief that race relations could change gradually and called for more immediate developments: "me and my people are just about due". It was a key moment in her path to Civil Rights activism. "Old Jim Crow", on the same album, addressed the Jim Crow laws. After "Mississippi Goddam", a civil rights message was the norm in Simone's recordings and became part of her concerts. As her political activism rose, the rate of release of her music slowed.