List<List<string>> matrix = new List<List<string>>();

List<List<string>> matrix = new List<List<string>>();

List<List<string>> matrix = new List<List<string>>();

List<string> track = new List<string>();
track.Add("2349");
track.Add("The Prime Time of Your Life");
// etc
matrix.Add(track);

public class Track {
    public int TrackID { get; set; }
    public string Name { get; set; }
    public string Artist { get; set; }
    public string Album { get; set; }
    public int PlayCount { get; set; }
    public int SkipCount { get; set; }
}

var trackList = new List<Track>();

trackList.add( new Track {
    TrackID = 1234,
    Name = "I'm Gonna Be (500 Miles)",
    Artist = "The Proclaimers",
    Album = "Finest",
    PlayCount = 10,
    SkipCount = 1
});

Track firstTrack = trackList[0];

caspert,

Create a new class:

public class Track
{
   public Track()
   {

   }

   public String TrackName { get; set;}
   public String Artist { get; set; }
}

List<Track> tracks = new List<Track>();
Track tempTrack = new Track();
tempTrack.TrackName = "Consuming Fire";
tempTrack.Artist = "Tim Hughes";
tracks.Add(tempTracK);