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$tax_query = array(
	'relation' => 'OR',
	array(
		'taxonomy'         => 'epoche-stil',
		'field'            => 'slug',
		'operator'         => 'IN',
		'include_children' => true,
	),
	array(
		'taxonomy'         => 'epoche-zeit',
		'field'            => 'slug',
		'operator'         => 'IN',
		'include_children' => true,
	),
	array(
		'taxonomy'         => 'genre-gattung',
		'field'            => 'slug',
		'operator'         => 'IN',
		'include_children' => true,
	),
);