band music site + internet directory

ok, so i got these 2 old domains, approx 20 years old which rank in search engines position 1 and 2 with a few keywords. One is about free internet in X country and the other about a famous music band which did a gig many years ago.

I need some ideas how to transform these considering they are authority domains. It is obvious it has to be remain related... pure adsense i guess?