 The music of Tambu Bamboo bands, which grew out of slavery, grew in acceptance, and by the 1930s it was widely popular among a majority of folk bands everywhere in Trinidad and Tobago. There was the Helyar Bamboo Band, the Calvary Bamboo Band, and many others. As the Tambu Bamboo bands gained a following, they also began to change and innovate new and more complex forms of musical expression.