Conversation so far:
when did the macbook touch bar come out
The Touch Bar was first introduced in 2016.
what does the macbook touch bar do
The Touch Bar offers controls for volume, play, pause, skipping songs, as well as shuffle, repeat and search when the Spotify app is open.
what is the spotify app for
Spotify is a digital music, podcast, and video streaming service that gives you access to millions of songs and other content from artists all over the world.

Question: does the service cost money
Self-contained rewrite: does the spotify streaming service cost money