Currently I am working on a soundcloud downloader in C#. With the help of the SoundCloud API I get a JSON string of a playlist, which includes a lot of information of the tracks
You could try using Newtonsoft JSON Deserializer.
For your case you could do something like this:
Create a Track class with needed properties
Apply DeserializeObject
Track jsonObject = JsonConvert.DeserializeObject(json);
Iterate over jsonObject