I don't think you will hear every bit of the entire sound track during the ride, in other words, what you hear may be different when you ride a second time.
In the various "rooms" of the ride, portions of sound track, sometimes just a few words, repeat over and over. Some portions are instrumental music. Example: Country guitar/banjo plays from one side while Bre'r Frog on the other side goes "UM, um, UM, um" in time with the music.
There is supposedly an off topic remark "Go F.S.U." during the ascent to the big drop (one of the imagineers for the ride was a Florida State U. grad). Other remarks during said ascent refer to "the briar patch" (which the big drop falls into, note the big thorns) for which you have to know either the book "Tales of Uncle Remus" (sp?) or the movie "Song of the South".
I did think that, on at least one occasion when I rode, some of the speakers were malfunctioning so parts of the dialog were missing.
Disney hints:
http://members.aol.com/ajaynejr/disscav.htm
Bre'r Rabbit (stuck to a large glue mouse trap called the Tar Baby) to Bre'r Fox (holding fork and knife): "Skin me, do anything you want but pleeeeeeeez, don't throw me into that briar patch!"