Veteran American composers making important contributions to serious music include Roy harris , Howard hanson , Aaron copland , Virgil thomson , Walter piston , Roger sessions , and Wallingford riegger .
对现代的音乐有杰出贡献的老资格美国作曲家中包括哈里斯、汉森、科普兰、汤姆森,皮斯顿、塞欣斯和里格等多人。