public static ArrayList<Track> randomTracks(int nArtists) {
		ArrayList<Track> tracks = new ArrayList<Track>();

		final int albumsPerArtist = 3;
		final int tracksPerAlbum = 8;

		for (int i = 0; i < nArtists; i++) {
			String artist = getRandomString(4);

			for (int j = 0; j < albumsPerArtist; j++) {
				String album = getRandomString(6);

				for (int k = 0; k < tracksPerAlbum; k++) {
					Track track = new Track();
					track.put(
							"id",
							Integer.toString(i * albumsPerArtist
									* tracksPerAlbum + j * tracksPerAlbum + k));
					track.put("artist", artist);
					track.put("album", album);
					track.put("title", getRandomString(10));
					tracks.add(track);
				}
			}
		}

		return tracks;
	}