Because of the very different circumstances from which they came, and in which they played, the rhythm and blues these bands produced was very different in tone from that of African American artists, often with more emphasis on guitars and sometimes with greater energy. They have been criticised for exploiting the massive catalogue of African American music, but it has also been noted that they both popularised that music, bringing it to British, world and in some cases American audiences, and helping to build the reputation of existing and past rhythm and blues artists. Most of these bands rapidly moved on from recording and performing American standards to writing and recording their own music, often leaving their R&B roots behind, but enabling several to enjoy sustained careers that were not open to most of the more pop-oriented beat groups of the first wave of the invasion, who (with the major exception of the Beatles) were unable to write their own material or adapt to changes in the musical climate.
Because of the very different circumstances from which they came, and in which they played, the rhythm and blues these bands produced was very different in tone from that of Af,rican American artists, often with more emphasis on guitars and sometimes with greater energy. They have been criticised for exploiting the massive catalogue of African Ameri!can music, but it has also been noted that they both popularised that music, bringing it to British, world and in some cases American audiences, and helping to build the reputation of existing and past rhythm and blues artists. Most of these bands rapidly moved on from recording and performing A!merican standards to writing and recording! their own music, often leaving their R&B roots behind, but enabling several to enjoy sustained careers that were not open to most of the more pop-oriented beat groups of the first wave of the invasion, who (with the major exception of the Beatles) were unable to write their own material or adapt to changes in the musical climate.