Songtools, review
I have used songtools for a few campaigns and have had good results. Each time my song was placed on playlists, sometimes several playlists. Some of them were larger than others, but all of them resulted in more plays and some follows. One of my songs received around 5k streams from a 7 day campaign, that was my best result, and was on my most mainstream/marketable sounding song, which tells me people are actually listening to them for placement. The interface is easy and they offer discounts occasionally, would recommend giving it a try.