You'll need to use a VPN to access Play (as if from a country where spotify is available).
Good news!
Spotify is now available in Tanzania
You can read more information about Spotify's launch in new markets in this news article: Spotify Expands International Footprint, Bringing Audio to 80+ New Markets
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…