What defines underground music?

How has the evolution of technology and social media platforms influenced the growth and impact of underground music scenes globally?🙈

You don’t need a major label push anymore and you can get your music out to a wider audience whereas back in the day you needed a major to sort of stamp you or you had to have a big buzz to gain traction

More of just like a EDM type vibe, like the old garage band style

thats a hard question.. i guess there lowkey