Lots of people make a living composing, mixing and/or producing music in every country. The question is how many in each country and how difficult is it to do so. I live in America, and it is EXTREMELY difficult to earn a living from this even if you have excellent skills. The average person has to do way more than just one thing in music to survive, and often at the low end of the scale. I would say perhaps 1 in 100,000 people who try succeed and their earnings are relatively low compared to someone with a more stable career choice.
This is because the cost of living here is very high compared to the income you can make from music. I live in a very expensive state here in the US. My monthly rent is higher than the yearly salary of most people in Eastern Europe who are not musicians and work regular jobs… and that doesn’t include my food, car, utilities, etc… Our salaries are a lot more here, but it doesn’t go as far.
One thing is for sure, and that is that income potential everywhere is decreasing because of market overload and the changing nature of the music business caused by the continuing rise of the internet. Watch this recent video from Christian Henson in the UK, another expensive country. He is one of the owners of sample library makers Spitfire Audio. Basically, it explains a serious issue that affects all of us in a negative way and could be devastating in the near future.
Here’s another one from American musician Rick Beato, who has had hit records as a songwriter. In December 2016, he had the same basic view on the industry’s decline.