Simplify the following text for a Grade 8 native English-speaking person.
Original: `` Do n't Question My Heart '' by Saliva featuring Brent Smith , a new version of the song originally performed by Kyle Morrison of the band Shattersphere , was later used to open ECW for the rest of the program 's run .
Simplified: Since then the theme song has changed between a number of different songs before settling on `` Do n't Question My Heart '' , sung by Kyle Morrison of the band Shattersphere . A remix of `` Do n't Question My Heart '' by Saliva featuring Brent Smith is now used .