Listeners get acces to the largest music database in the world, without them having to do anything. Artist can specifically target their audience by adding "sponsored songs".
The google for Radiu. Radiu aggregates all the radiostations in the world, indexes and monitors them, curates a personal playlist/radiostation out of it and makes it searchable.
Every person in the whole world who likes to discover new music and has internet acces and artists who would like to target their potential audience.