MVC Form Handling

I just would like to know if I am heading in the right direction with this. I am trying to learn and understand the concept of MVC, and I am doing that while making my own webpage, so I can learn a little bit more each time. I do not want to put too much code here, but I would simply like to ask, am I doing this right, and if not, what would you do different, and most importantly, why?

This little piece of code is in the controller for "Tracks".

public function viewForm()
{
    if($_SERVER['REQUEST_METHOD'] == 'POST') 
    {
        $artistID       = $_POST["artistID"];
        $artistName     = $_POST["artistName"];
        $trackName  = $_POST["trackName"];
        $trackLink  = $_POST["trackLink"];

        $tracks = $this->loadModel('TracksModel');
        $tracks->addTrack($artistID, $artistName, $trackName, $trackLink);

        header('location: ' . URL . 'tracks/viewform?submit=true');
    }
    require 'application/views/tracks/viewform.htm';
}

And this is in the model for it:

public function addTrack($artistID, $artistName, $trackName, $trackLink)
{
    $sql    = "INSERT INTO music_tracks (artistID, artistName, trackName, trackLink) VALUES (:artistID, :artistName, :trackName, :trackLink)";
    $query  = $this->db->prepare($sql);

    $query->bindParam(':artistID', $artistID, PDO::PARAM_INT);
    $query->bindParam(':artistName', $artistName, PDO::PARAM_STR);
    $query->bindParam(':trackName', $trackName, PDO::PARAM_STR);
    $query->bindParam(':trackLink', $trackLink, PDO::PARAM_STR);

    $query->execute(array('artistID' => $artistID, ':artistName' => $artistName, ':trackName' => $trackName, ':trackLink' => $trackLink));
}