Ad selection could be a little fine tuned. When I am listening to classical music, I am probably not interested in hearing an advertisement for a new pop album coming out. In fact this is the most open I'll be to hearing ads for similar music. It has been jarring to have pop albums blare in in between Christian music, or classical playlists.
Although this idea has been suggested first, I'd like to merge it with a more popular idea to ensure this idea gets the best attention it deserves: