It seems your call should besomething like that:
$page .= array_walk($band_data, shows_row($argument1, , ));
and not
$page .= array_walk($band_data, 'shows_row');
because your function definition is like that:
function shows_row($ar, $class_bnd='band', $class_lnk='band') {
althought I don't know about array_walk() , it's just a syntax problem I see
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