I absolutely loved (and miss) We Are Hunted's music discovery engine.
They recently started putting out the emerging charts again on Spotify, which is interesting (they were on twitter music, but since you only got a few second-clips of songs, it was useless to me): https://twitter.com/wearehunted/status/381496704052129792
Had they thought about it some more, marketed themselves better and integrated more of the features from We Are Hunted's music discovery engine, maybe it might have faired better. It's obvious this was very much an acquihire type of situation.