Brock Speer
Brock Speer sang bass for the Speer Family Southern Gospel musical group and was a leader in Southern Gospel music.
Jackson Brock Speer was born in Winston County, Alabama, just two months before his father and mother began a singing group called the Speer Quartet. For the remaining seventyeight years of his life, he was inextricably intertwined with that group. With only one exception World War II he sang with his family his entire life.
Source: Wikipedia