Ziz said:
You're going to have to hope someone has vintage TV rips they saved, or else get yourself the appropriate recordings of the problem songs and re-mix them into the existing audio. A few S4 eps say "Disc Only" on NF streaming.
Running for Honor
It's A Wonderful Leap
A Leap For Lisa
I think it might be easier to just have the audio from the episodes and then the PGC for the video. Otherwise I wouldn't have any idea what to do to add in the songs while removing the muzak.