WP_Query
<?php
$args= array(
'post_type' => array( 'post', 'snippet' )
//'post_type' => 'snippet',
);
$the_query = new WP_Query( $args );
?>
<?php if ( $the_query->have_posts() ) : ?>
<?php /* Start the Loop */ ?>
<?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>