Order posts alphabetically using the pre_get_posts hook

gistfile1.aw

<?php

add_action('pre_get_posts', 'blog_change_sort');

function blog_change_sort( $query ) {

    // Only modify main query
    // On the tutorial category page
    if( $query->is_main_query() && is_category('tutorials') ) {
        $query->set('orderby', 'title');
        $query->set('order', 'ASC');
    }
}

?>