Performers at this year's Ball have had a whopping 12 Big Top 40 No.1s between them! This image appears in the gallery:Summertime Ball 2012 Line-Up Teasers 10. Performers at this year's Ball have had a whopping 12 Big Top 40 No.1s between them! 13 images See the full gallery: Summertime Ball 2012 Line-Up Teasers