Combine two foreach Arrays into one table row

if the artist names and track names are in matching order and the same in number then:

<?php
$artists = get_post_custom_values('Artist', $post->ID);
$tracks = get_post_custom_values('Track', $post->ID);
$i=0;
foreach ( $artists as $key => $value ) {
    $class = ( $i % 2 ) ? 'alternative' : ''; // modulus operator
    echo '<li class="' . $class . '">';
    echo $value . ' - '; 
    echo tracks[ $i ] . '</li>';
    $i++;
}
?>

otherwise if there is some other way they are matched up you need to figure that out in the loop.