/** Get an album chart for a group, for a given date range. If no date range is supplied, it will return the most recent album chart for this group.
*
* @param string $group The last.fm group name to fetch the charts of. (Required)
* @param integer $from The date at which the chart should start from. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
* @param integer $to The date at which the chart should end on. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
* @return array An array of Album objects.
*
* @static
* @access public
* @throws Error
*/
public static function getWeeklyAlbumChart($group, $from = null, $to = null){
/** Get an artist chart for a group, for a given date range. If no date range is supplied, it will return the most recent album chart for this group.
*
* @param string $group The last.fm group name to fetch the charts of. (Required)
* @param integer $from The date at which the chart should start from. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
* @param integer $to The date at which the chart should end on. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
/** Get a track chart for a group, for a given date range. If no date range is supplied, it will return the most recent album chart for this group.
*
* @param string $group The last.fm group name to fetch the charts of. (Required)
* @param integer $from The date at which the chart should start from. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
* @param integer $to The date at which the chart should end on. See {@link de.felixbruns.lastfm.Group#getWeeklyChartList Group::getWeeklyChartList} for more. (Optional)
* @return array An array of Track objects.
*
* @static
* @access public
* @throws Error
*/
public static function getWeeklyTrackChart($group, $from = null, $to = null){