Billboard and Mediabase have both updated their music charts for the week ending September 17th.Now coming in at #1 on the Mediabase Active Rock Chart is Green Day's "Bang Bang." The song is up one position from #2 on last week's chart. On the charting service's Alternative chart, the song is at #7, unchanged from last week.On the Billboard side, where the song hit #1 on the Mainstream Rock Songs chart last week, here is how the song is doing.Stays at #1 for second weekUp one spot to #4Stays at #7 for second weekStays at #16 for second week