School of Rock can refer to a number of things, including a 2003 film, a TV series, a 2015 stage musical and an international music education program.

Those relevant for ESAT are:

The School of Rock music education franchise

Originally founded by Paul Green, the original School of Rock is a for-profit educational company that operates and franchises after-school music instruction schools in the United States, Chile, Canada, Brazil, Peru, Colombia, South Africa, Mexico, Australia, Paraguay, Taiwan, Ireland, Spain, Portugal, and the Philippines.

For more on the original company, see https://en.wikipedia.org/wiki/School_of_Rock_(company)

For more on the South African branch of the company (based in Claremont, Cape Town), see https://www.schoolofrock.com/locations/claremont