Where did the blues music come from when they were slaves?

Blues music has its roots in the music of West Africa, which was brought to America by enslaved African people. These people combined musical traditions from Africa with elements of European music, leading to the development of blues. Early blues singers often sang about their experiences of slavery, racism, and poverty in the form of "work songs" or "field hollers." These songs served as a means of expressing their sorrow and hardships, as well as providing a form of entertainment during difficult times. Blues also incorporates improvisation and call-and-response patterns commonly found in African musical traditions. Over time, blues music evolved and began to spread beyond the plantations, eventually transforming into the diverse genres of blues we know today.