I tried out Playlist Push after the service came highly recommended during a music marketing course. For our latest single, the service was quite effective in boosting Spotify numbers! If you have a strong song that fits a certain mood and the budget I would definitely give Playlist Push a go. If you ran campaigns over multiple singles you could gain some solid Spotify numbers. My only critique is the cost is on the expensive side - I'm in AUS so there is a conversion rate.

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Great service and results. You do need to be objective about your music so that you will set realistic expectations for yourself. Keep living the dream making your art and putting it out there!