If a station plays an advertisement before playback begins, Audials One 2020 will label it with the word ‘Ads’ to warn you.
You can also look for stations by country, and there’s a solid search tool if you have something more specific in mind. The sheer number of stations available could have been a nightmare to navigate, but thankfully the huge list is broken down into sensible categories (pop, rock, chillout etc), which are then split into more esoteric genres.
Fancy listening to a radio station live, rather than just a single song? Again, Audials One has you covered.