But if you want to use
>it on a portable device like a smartphone, and listen to all
>the music in the world anytime, you have to pay like 10 euros/
>month ($15).


To add to that:

- If you want full quality (or to be more precise: a high bit rate)

- if you want to listen without seeing (on the interface) and hearing adds

you will have to pay the subscription fee too. At least this applies to Spotify.