Wow Factor / lineartubeaudio.eu is a official Roon provider. We like Roon a lot that is not a secret and this is why they are our partner. Roon is easy to use. You can organize your files and create playlists. An important feature is that Roon learns your taste and broaden you mind by introducing you for band/orchestras you never heard about before.
We use Roon together with Tidal music streaming service - owned by artists. We are aware of other music streaming providers but they are not available in Denmark. Tidal deliver "standard" resolution and "High resolution" files and blend perfect with Roon.