function rational_get_meta( $value ) {
	global $post;

	$field = get_post_meta( $post->ID, $value, true );
	if ( ! empty( $field ) ) {
		return is_array( $field ) ? stripslashes_deep( $field ) : stripslashes( wp_kses_decode_entities( $field ) );
	} else {
		return false;
	}
}

function rational_add_meta_box() {
	add_meta_box(
		'rational-sample-title',
		__( 'Sample Title', 'rational' ),
		'rational_sample_title_html',
		'post',
		'side',
		'core'
	);
	add_meta_box(
		'rational-sample-title',
		__( 'Sample Title', 'rational' ),
		'rational_sample_title_html',
		'page',
		'side',
		'core'
	);
}
add_action( 'add_meta_boxes', 'rational_add_meta_box' );

function rational_sample_title_html( $post) {
	wp_nonce_field( '_rational_sample_title_nonce', 'rational_sample_title_nonce' ); ?>

	<p>Here's a brief description of what the box is for.</p>

	<p>
		<label for="rational_sample_title"><?php _e( 'Artist', 'rational' ); ?></label><br>
		<input type="text" name="rational_sample_title_artist" id="rational_sample_title_artist" value="<?php echo rational_get_meta( 'rational_sample_title_artist' ); ?>">
	</p>	<p>
		<label for="rational_sample_title"><?php _e( 'Bio', 'rational' ); ?></label><br>
			<textarea name="rational_sample_title_bio" id="rational_sample_title_bio" ><?php echo rational_get_meta( 'rational_sample_title_bio' ); ?></textarea>

	</p><?php
}

function rational_sample_title_save( $post_id ) {
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
	if ( ! isset( $_POST['rational_sample_title_nonce'] ) || ! wp_verify_nonce( $_POST['rational_sample_title_nonce'], '_rational_sample_title_nonce' ) ) return;
	if ( ! current_user_can( 'edit_post' ) ) return;

	if ( isset( $_POST['rational_sample_title_artist'] ) )
		update_post_meta( $post_id, 'rational_sample_title_artist', esc_attr( $_POST['rational_sample_title_artist'] ) );
	if ( isset( $_POST['rational_sample_title_bio'] ) )
		update_post_meta( $post_id, 'rational_sample_title_bio', esc_attr( $_POST['rational_sample_title_bio'] ) );
}
add_action( 'save_post', 'rational_sample_title_save' );

/*
	Usage: rational_get_meta( 'rational_sample_title_artist' )
	Usage: rational_get_meta( 'rational_sample_title_bio' )
*/