PHP - if statement - with - if isset - using multiple variables issue

I am having a problem of syntax my code correctly and i would like some help. I would like to use an if statement and if isset with multiple variables. My existing code is this.

$album_name = $_POST['album_name'];
$img = $_POST['image'];
$artist = $_POST['artist'];
$company = $_POST['company'];
$genre = $_POST['genre'];
$price = $_POST['price'];
$buy_now = $_POST['buy_now'];

if($album_name !='') && if (isset($artist, $company, $price, $buy_now)){
    $sql = mysql_query ("INSERT INTO top_albums_info (album_name, image, artist,company,genre,price,buy_now) VALUES ('$album_name','$img','$artist','$company','$genre','$price','".$buy_now."') ");
    echo'<meta http-equiv="refresh" content="0;url=../index.php?page=top_section&action=list">';
}else{
    echo'<meta http-equiv="refresh" content="0;url=../index.php?page=top_section&action=add&msg=empty">';
}

?>

How can i combine them?

Thanks.