Selma’s on the line Sunday night on NBC television when a couple of former residents take to the stage with the a cappella sextet Street Corner Symphony.

It’s a guarantee many folks who know Jon and Mark McLemore have already called into the show, “The Sing-Off” to vote for their group to win the $100,000 and Sony recording contract. The emails and Facebook postings have flown as fast as a jet across the ocean urging Selma and Dallas County people to call 1-877-674-6402.

The two men are the sons of Tom McLemore, minister of Houston Park Church of Christ. McLemore said Thursday he’s kept up with his sons’ progress on the television.

But he’s not surprised.

Music runs in the family. McLemore’s father played steel guitar with touring country artists, such as Cowboy Copas, at the Grand Ole Opry back in the early post-World War II days.

Because the elder McLemore grew up in a home filled with music, he learned to play the banjo, guitar and dojo, which a cross between the Dobro-style guitar and the banjo. McLemore also has sung in a number of groups in high school and college.

“We’ve been kind of a musical family over the years,” he said.

Then came the sons.

The oldest, Jon, started singing in school when the family lived in Ridgeland, Miss. At Madison Central High School in Madison, Miss., Jon was part of a madrigal group that also had Jeremy and Richie Lister, two more members of Street Corner Symphony.

“I can see them in their costumes now,” McLemore said of his son and the other brothers.

Everybody played an instrument in the band and sang in the choruses and the choirs.

Jon, 33, graduated from Madison Central before the McLemores moved to Selma and the elder McLemore took the pastorate at the Houston Park church. He’s a Church of Christ minister in Lewiston, Mont., is married and has five children, McLemore said.

Mark continued to sing as a student at John T. Morgan Academy. He graduated from there and went to Huntingdon College, where he majored in music. While there, he met the other two members of Street Corner Symphony.

McLemore said his son recruited the two former classmates into the group after some others tried, but dropped out of the group.

Mark, 26, lives in Montgomery, but most Sundays people in the Houston Park congregation see him and his wife. Mark leads singing in his father’s church — another reason for the focus on a capella singing — the Church of Christ believes strictly in the New Testament example of a cappella singing as the only music used in the worship, based on Ephesians 5:19, which says, “Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord.”

Tom McLemore said he has received many telephone calls about his sons’ performances and from people wishing his sons well in their endeavors.

McLemore said he has voted for Street Corner Symphony on the reality television program. He is proud of his sons.

“I think they both were gifted musically coming up,” he said. “Mark is probably more diverse. But they have good backgrounds in bands and college-level musical training.”

Apparently, the judges on “The Sing-Off” agree, giving the group high praise for the harmonies and solos heard in various performances during the last several weeks.

Monday at 7 p.m., the group will take the stage in a live performance on NBC for the show’s finale. The winners will be announced.