Look at the top right of your sheet music. The arranger is usually listed there. Then google the tune name and arranger. More often than not you'll find a recording, either video or mp3. I only have the 2nd tenor part, and there are lots of versions of these out there on youtube. I'd love to hear the exact arrangements, but not sure how long it would take me to find them. And there may not even be videos of songs performed from these charts for all I know.