I wouldn't call Mike Minor an "awful" singer. It's just that his type of music was not very "hip." He had a deep baritone voice. I guess the producers were trying to attract the same audience that watched "The Lawrence Welk Show."
The girls, however, sang more pop tunes. They actually recorded a few singles, and toured the country singing in local venues. I have a music CD of their unreleased tracks, and it's actually quite good.
That sounds interesting. I do like the pop tunes. I hope if the rest of this series does make it to DVD, that the songs aren't deleted or changed.