Found this Clay & Scott recording at Amazon. It's for sale new for $12.33 and used for $9.50. I never heard of these guys - looks like it's all gospel and you might like it.

There are sound samples, including one of "My Mother Left Me Standing On The Highway."

Here's the Primarily A Capella website Gospel and Christian A Capella page. Again, they have songs/arrangements for sale. No freebies.

I couldn't find the lyrics, but if the words are to be found, I'm sure Masato and/or Dicho will find them.