Exclude page name from loop

Question

I'm currently using this loop:

if (is_single() || is_page() ) :
  if (have_posts() ) :
    while (have_posts() ) :
    the_post();

How can I exclude multiple pages within the loop?
For an example, I want to exclude pages example.com/music and example.com/contact.

EDIT:

I've done the way G.M provide, but my music and contact pages keeps loading after apply.

<?php if (is_single() || is_page() ) : if (have_posts() ) : $exclude_pages = array('music', 'contact'); while (have_posts() ) : if ( is_page() && ! empty($exclude_pages) && (
      in_array($post->post_name, (array)$exclude_pages) ||
      in_array($post->post_name, (array)$exclude_pages)
  ) ) continue; the_post(); ?>
<meta name="description" content="<?php the_content_limit(150)?>" />
// loop continues
<?php endwhile; endif; 
elseif (is_home() ): ?>
// loop continues

<?php endif; ?>

<?php if( is_page( 'music' )) { ?>
<meta property="og:image" content="" />
//loop continues
<?php } ?>

So to clarify: I'd like to exclude some meta tags that i'm generating via a loop in the header.php Now with my loop, all pages and post get affected by the loop. So I don't want the pages music and contact to have the same header tags from the loop in header.php.

Answer 1

An alternative way is putting the unwanted pages in an array. Useful for storing them in a option or in a serialized custom field.

$exclude_pages = array('music', 'contact');
// can be something like this: $exclude_pages = get_option('exclude_pages');

if ( have_posts() ) : while ( have_posts() ) : the_post();
  if ( is_page() && ! empty($exclude_pages) && (
      in_array($post->post_name, (array)$exclude_pages) ||
      in_array($post->post_title, (array)$exclude_pages)
  ) ) continue; // skip


  // the rest of your loop here

Edit

To also exclude some post type you can use:

$exclude_pages = array('music', 'contact');
$exclude_post_types = array('music', 'any_here');

if ( have_posts() ) : while ( have_posts() ) : the_post();
  if ( is_page() && ! empty($exclude_pages) && (
    in_array($post->post_name, (array)$exclude_pages) ||
    in_array($post->post_title, (array)$exclude_pages)
  ) ||
  ( is_single() && in_array(get_post_type(), (array)$exclude_post_types) ) ) continue;

Answer 2

is_page() will take a parameter for the page slug. That plus some logic operators should do it.

if (
  (is_single() || is_page())
  && (
    !is_page('music')
    || !is_page('contact')
  )
)

Note: it is very easy to get the logic wrong on these, and I didn't test that. It may not be quite right but I am sure it is close.