I'm really glad this thread is here, thanks to deeder for resurrecting it (no pun intended...ok, maybe a little).
To whomever asked about the Statler Bros. style music, it's Southern Gospel. Most of it was poorly recorded low-budget stuff, but there have been some great groups, with wonderful harmonies. From the 60's and 70's the premier groups were the Statesmen and Blackwood Brothers. From the 70's to the 90's the premier group was the Cathedral Quartet. From them came Legacy 5, probably the biggest group currently. With Southern Gospel, you get anything from campy tent-meeting stuff to lush, smooth jazz and swing based groups.