[To read an introduction to The Great Voices Project, click here.] [To see previous parts of the list, click on these links: #50-#46 … #45-#41 … #40-#36 … #35-#31 … #30-#26.] —————————————— #25: Richard Sterban As a tenor, I have always been amazed by guys who are able to sing powerful bass. Richard Sterban of the Oak Ridge Boys has one of the most powerful bass voices ever recorded. Seemingly limitless in how deeply he can sing, his voice has provided the foundation for not only the Oak Ridge Boys, but also Elvis Presley and the gospel quartet the Stamps. Probably most famous for his “fun” parts in such hits…