public function getWeeklyChartList($methodVars)
    {
        // Check for required variables
        if (!empty($methodVars['user'])) {
            $vars = array(
                'method' => 'user.getweeklychartlist',
                'api_key' => $this->auth->apiKey
            );
            $vars = array_merge($vars, $methodVars);

            if ($call = $this->apiGetCall($vars)) {
                $i = 0;
                foreach ($call->weeklychartlist->chart as $chart) {
                    $weeklychartlist[$i]['from'] = (string) $chart['from'];
                    $weeklychartlist[$i]['to'] = (string) $chart['to'];
                    $i++;
                }

                return $weeklychartlist;
            } else {
                return false;
            }
        } else {
            throw new InvalidArgumentException('You must include artist variable in the call for this method');
        }
    }