Keyed Up Piano Products
The tapes from Keyed Up Piano Products were the first instructional tapes I ever bought, and Roger Bennett, the author, was an outstanding pianist. He was the pianist for the Cathedrals for many years, and then became a founding member of the Southern Gospel Quartet, Legacy Five.
I personally own two of his videos, two piano solo books, and countless recordings. His style is Southern Gospel, so if that is the style you are looking for, then this is a good place to get it. One of these days, I'll get his third instructional video, too, on the Nashville Number System.
Mr. Bennett went home to be with the Lord in 2007.