What a rip...!
As said before, there was nothing in this game that hadn't already been done in GHII, there are only 30 pretty obscure songs (I grew up in the 80s and barely recognised any of them!) and unlike the two before, there is no option to buy extra tracks as you progress. Medium level is far easier than GHI or II, which is probably a good thing because I had no wish to have to play these songs over and over again to get 5 stars.
Frankly, unless you're desperate for some new songs to play, I would avoid this game like the plague!