콘래드 존슨과 캐시미어 스테이지 밴드 이야기. 콘래드 존슨은 별 볼 일 없는 학교 재즈 밴드를 전설적인 펑크 집단으로 만든다. 그로부터 35년이 지나고, 학생들은 자신들의 인생을 바꿔놓은 존슨 교수에게 경의를 표하는 무대를 마련하기로 한다. 악기에 쌓인 먼지를 털어내고 다시 돌아온 무대 위에 변치 않은 그들의 음악 세계가 다시 펼쳐진다.

THUNDER SOUL tells the true story of Conrad O. Johnson and the legendary Kashmere Stage Band. It was afros, pleated pants and platform shoes; James Brown, Sly Stone and Bootsy Collins. It was the '70s, and an inner-city Houston high school was about to make history. Charismatic band leader, Conrad "Prof" Johnson would turn the school's mediocre jazz band into a legendary, world-class funk powerhouse. Now, 35 years later, his students prepare to pay tribute to the man who changed their lives, the 92-year-old Prof. Some haven't played their horns in decades, still they dust off their instruments determined to retake the stage to show Prof and the world that they've still got it.