public ActionResult SongsAddedPerDay(DateTime?cutoff)
{
var values = queries.SongsAddedPerDay(cutoff);
var points = values.Select(v => Tuple.Create(new DateTime(v.Year, v.Month, v.Day), v.Count)).ToArray();
return(DateLineChartWithAverage("Songs added per day", "Songs", "Number of songs", points));
}
