A lot of Spotify fans don't know about the new feature in Spotify that allows you read your song lyrics. The feature allows for both free and premium subscriber to view the lyrics of a song that is playing. You can add or edit lyrics of the song too.
To view the lyrics of a song, play a song and check out the lower right of the playing song and click "Lyrics"
This will display lyrics of the song you are listening to, you can either see half lyrics or full lyrics of your song.
If you are outside the US, you might find it difficult to use Spotify, you can read how to change your IP address and use Spotify anywhere in the world, or buy a premium account.