How can I make a post that belongs to a category or have specific tags, display different from the other single posts?

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How can I make a single post display different from the other single posts when I add it to a specific category.

example: I have a post that is in 3 categories: music, songs & video clips. I want every time that I add a post in category “songs”, it will be displayed differently from all of the other default single posts that don’t belong to the category songs. How can I do that?
Also, can the same thing happen with tags too? Meaning, when I add to a post some specific tags can it change the template of the post?

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  1. With CSS: If your theme uses post_class() on a containing element, you can target that element with the class .category-songs to control styling.

    With a template filter: add a filter to single_template and check the assigned categories for your songs category, and use the template songs-single.php if that category is found:

    function wpse_check_single_categories( $template = '' ){
    $categories = get_the_category();
    foreach( $categories as $cat ):
        if( $cat->name == 'songs' ):
            $template = locate_template( array( "songs-single.php", $template ), false );
        endif;
    endforeach;
    return $template;
}
add_filter( 'single_template', 'wpse_check_single_categories' );