Edit custom post columns

functions.php

add_filter("manage_edit-artist_columns", "artist_edit_columns");

function artist_edit_columns($columns) {
	$columns = array(
		'cb' => '<input type="checkbox"/>',
		'thumbnail' => __('Image'),
		'title' => __('Artist'),
		'performance' => __('Type'),
		'slides_home' => __('on Homepage'),
	);
	return $columns;
}