Is me promoting a company in the music industry haram

I am an email marketer freelancer by profession, I use email channels to promote products and services. For some time I've been promoting a company's software that allows people to learn drums and today I started promoting their DRUM kit, I didn't realize that I was promoting a product/service from the music industry until today when I was writing email content for the drum kit. I want to know if what I have been doing is haram and if yes then what should I do with the money I earned from it. I have always been steadfast in avoiding companies that are in the haram industry, I've been approached by several clients in the haram industry, and I always outright rejected them but this time I didn't realize it until today. Can anyone please tell me if what am doing is wrong?