I remember Radio Luxembourg. Until they shook up their attitudes after the pirate stations started, many of their programmes were sponsored by record companies, and did not always play complete songs -- just enough to advertise what they were currently trying to sell.
The Pirate stations were much better, especially Carolines North and South, and "Big L" (Radio London). Amonst others, they gave us Johnny Walker, John Peel, the above-named Emperor Rosko (a.k.a. Michael Pasternak, son of film producer Joe Pasternak), and the zany Kenny Everett.
But I think my favourite presenters are/were Bob Harris, and someone who called himself Brother John on AFN (American Forces Network) Germany (Frankfurt ?). Reception on Medium Wave could be patchy, but his attitude seemed to be maximum music, minimum chat, and he played lots of obsure (to me) rock music, that you almost never heard on UK radio. The shows were compiled entirely by USA military personnel. It seemed strange for a military person to sign off at the end of programmes by wishing us "Peace, Brother".
Unfortunately they later stopped local production and started to rebroadcast syndicated music shows presented by a rather irritating character "Wolfman Jack", playing mostly boring pop.