I am a weirdo who has kept their Napster subscription active. I listen to classical music, and it can be difficult to track down specific recordings I prefer again. Depending on which recording it is, it might be listed under the composer, the performer/group, the conductor or under some random compilation like "relaxing piano music" or "best TV commercial classical" or some crap. Even though Napster really sucks, I have just been too lazy to go through the effort of finding these recordings again on other services.
All that said, I've been hitting EDM/techno really hard lately because I use a lot of it as study music. Top hits for me lately have been Aphex Twin, Dorian Concept, SBTRKT, and Infected Mushroom. I used to have a DI.FM subscription. May reboot that if I get bored with my current library.