NASHVILLE, Tenn. (AP) – Two of country music’s top vocal harmony groups, the Oak Ridge Boys and the late Jim Ed Brown and his sisters Maxine and Bonnie, have been inducted into the Country Music Hall of Fame. Also inducted during a ceremony Sunday night in Nashville, Tennessee, was the late guitar great Grady Martin. Garth Brooks, Trisha Yearwood, Dierks Bentley, Vince Gill and Marty Stuart performed tributes. Oak Ridge Boys members Joe Bonsall, Duane Allen, William Lee Golden and Richard Sterban each received a medallion as the newest members of the hall. Jim Ed Brown was inducted at his bedside a few days before his death in June, and his sisters received their medallion during the ceremony. Martin, who played with Elvis Presley, Johnny Cash, Patsy Cline and Willie Nelson, died in 2001, and his son accepted the honor on his behalf.