According to the passage, the "African-American experience") is crucial to country music because other previously established African-American genres A. other previously established African-American genres provided the instrumental and vocal basis for country music B. other previously established African-American genres were not as well developed as country music C. other previously established African-American genres preceded country music D. other previously established African-American genres weakened the popularity of country music E. other previously established African-American genres were more accepted and conventional than country music