Add a custom shortcode section to the storefront themes homepage template.

storefront-custom-homepage-shortcode-section.php

function sf_output_custom_shortcode_section() {

    echo '<section class="storefront-product-section storefront-product-category">';

        echo '<h2 class="section-title">' . __( 'Music Category', 'storefront' ) . '</h2>';

        echo do_shortcode( '[product_category category="music" columns="4" per_page="4"]' );

    echo '</section>';

}
add_action( 'homepage', 'sf_output_custom_shortcode_section', 50 );