I just went through this process a few months ago. I was looking for a long time, testing, and eventually settled on PromosoundGroup. It was the only service that had a real effect: my streams went up, my track got into playlists on Spotify, and most importantly, I had real listeners.

They've been working since 2010, and you can feel it: everything is competent, there is support, no risks for accounts. I also ordered Instagram promotion, which is also top-notch. No “cheating”, everything is organic.

If someone is looking for adequate promotion without falsity, promo sound group is really worth a look.