The money comes from taxes that bars, clubs, restaurants, hotels and televisions in Congo pay from the music they play. Just the way it happens in Europe. Its not alot because its mostly focused on Kinshasa and most hotels, bars, clubs and televsions are not really fair in paying those taxes. Imagine if they were receiving money from Katanga, Kivu, Kongo Central, Kasai, etc. That would quickly go into billions. However, the small amount Socoda receive is still money and they receive it they steal it and peannuts being giving to artists they like, other receiving nothing and x times in the years them sharing chicken and rice to artists who are afflited there. I remember some years back some artists complaining why Manda Chante was receiving alot of money while his music is barely played compared to late Madilu and late Pepe Kalle.
Congolese bandleaders receive money from SACEM (France) others from SABAM since the 80s. After that Tabu Ley wrote them in the late 80s a letter that Soneca wasn't fair and most Congolese bandleaders who were often coming to France getting afflieted there.