As we all know the Wii did get a little bit of a shaft on this album, do to system limitations. When we downloaded AR, and after browsing and playing a few songs we tried to load up the medley, as a playlist and play it all at once.
Given a choice, I would prefer that grouping of songs to be "one song" instead of chopped into pieces.
Between the normal song gap lag, then add in the SD loading card lag, it wasn't very smooth, and sure didn't feel like we were playing the medley as it was intended, just disjointed song combos stopping at random intervals for up to a minute on some.
Not a complaint, but a comment on the OP question: We are having more fun with SP DLC in general.