SELECT * FROM vinyl_tracks vt
INNER JOIN vinyl_keys vk ON vt.mKeyID = vk.mKeyID
INNER JOIN vinyl_tracks_styles vts ON vt.trackID = vts.trackID
INNER JOIN vinyl_styles vs ON vts.styleID = vs.styleID
WHERE vinylID = :vinylID

SELECT * FROM vinyl_tracks vt
INNER JOIN vinyl_keys vk ON vt.mKeyID = vk.mKeyID
WHERE vinylID = :vinylID

SELECT * FROM vinyl_tracks_styles vts
RIGHT JOIN vinyl_styles vs ON vts.styleID = vs.styleID
WHERE vts.trackID = :trackID

array (size=2)
  0 =>
    array (size=3)
    'trackID' => string '868' (length=3)
    'styleID' => string '8' (length=1)
    'styleName' => string 'progressive house' (length=17)
 1 =>
   array (size=3)
    'trackID' => string '868' (length=3)
    'styleID' => string '17' (length=2)
    'styleName' => string 'progressive trance' (length=18)

SELECT * FROM vinyl_styles ORDER BY styleID ASC

$trackStylesQuery = $db->prepare("SELECT * FROM vinyl_tracks_styles vts
                        RIGHT JOIN vinyl_styles vs ON vts.styleID = vs.styleID
                        WHERE vts.trackID = :trackID");
$trackStylesQuery->bindParam(':trackID', $trow['trackID'], PDO::PARAM_INT);
$trackStylesQuery->execute();
$trackStyles = $trackStylesQuery->fetchAll(PDO::FETCH_ASSOC);
//var_dump($trackStyles);

$allStylesQuery = $db->prepare("SELECT * FROM vinyl_styles ORDER BY styleID ASC");
$allStylesQuery->execute();
$styles = $allStylesQuery->fetchAll(PDO::FETCH_ASSOC);
$stylesSelector = "<select multiple="multiple" class="form-control form-control-sm stylesSelector" name="styleID[".$trow['trackID']."][]"><option> &ndash; </option>";
foreach($styles as $style) {
    foreach($trackStyles as $trackStyle) {
        if(isset($trackStyle['styleID']) && ($trackStyle['styleID'] == $style['styleID'])) {
            $stylesSelector .= "<option selected="selected" value="".$style['styleID']."">".$style['styleName']."</option>";
        }
        else {
            $stylesSelector .= "<option value="".$style['styleID']."">".$style['styleName']."</option>";
        }
    }
}
$stylesSelector .= "</select>";