The app is free. The monthly ($12.99) or yearly ($129.99) subscription is available from or directly from iTunes or Google. Each subscription includes unlimited access to ALL audio streaming content available on the app plus the ability to make custom Playlists, and save shows or Playlists for Offline playback. All subscriptions include a 30 day free trial period so you have plenty of time to evaluate the app with the option to cancel before your first payment. HiFi subscriptions are also available monthly ($24.99) or yearly ($249.99) from or directly from iTunes or Google.

See also:
What is included with the free app vs. subscription?

Which artists are included on the app?