Original sentence: 2007 tour dates have been held at major venues 90% of the time, either as headliner with REO Speedwagon or as a special guest supporting act to Def Leppard
Edited sentence: And the loss of Dennis DeYoung has had an affect on the types of shows the band plays.For 2007, Styx has been an opening act for Foreigner and Def Leppard with their set being reduced to only about 45 minutes - a far cry of their tenure during Dennis DeYoung's heyday in the 1970s and 1980s