<div class="reviews-movies">
<h2>Movie Reviews</h2>
... 
</div>

<div class="reviews-albums">
<h2>Album Reviews</h2>
... 
</div>

<div class="reviews-books">
<h2>Book Reviews</h2>
... 
</div>

.movie-reviews, .album-reviews, .book-reviews, .magazine-reviews {/* Module Styles */} 

.reviews-movies {/* Sub-Module Styles */} 
.reviews-albums {/* Sub-Module Styles */} 
.reviews-books {/* Sub-Module Styles */}