In my experience, the results can vary a lot depending on the genre and where the existing audience spends time. Playlist pitching can bring discovery, while blogs and social media may help with credibility and getting people to check out more than one track. I’d also give a campaign enough time to see whether new listeners actually follow, save, or return to the artist. Instead of relying on one channel, I prefer combining a few that fit the release. For another option, you can check music promotions and compare the available approaches.