Conversation so far:
What products has the musician Usher come out with?
In 2007 musician Usher worked with Richard Herpin and Honoring Blanc for the fragrances Usher He and Usher She.
Were the fragrances Usher He and Usher She by musician Usher well received?
What was the slogan for the fragrances Usher He and Usher She by musician Usher?
What else did the musician Usher produce besides the fragrances Usher He and Usher She?
On March 30, 2015, it was announced that musician Usher is a co-owner, with various other music artists, in the music streaming service Tidal.

Question: What is Tidal?
Self-contained rewrite: What is the streaming service Tidal?