Hi Letlhogonolo

My best advice would be to seek assistance from people you know within the music industry or tap into your network to find people involved at said companies.

Other means would be to obtain data from google and try find previous studies that have been done on these companies. 

Hi Letlhogonolo,

You can publicly review digital music sales of from the respective music labels across a South Africa using the the following link: https://www.statista.com/outlook/202/112/digital-music/south-africa#market-globalRevenue