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.
What is the streaming service Tidal?
The service Tidal specialises in lossless audio and high definition music video with curated editorial.
Is the service Tidal a successful endeavor for the musician Usher?
The idea of having an all artist owned streaming service was created by those involved to adapt to the increased demand for streaming within the current music industry.
Is the musician Usher still working on the service Tidal?
What other products does the musician Usher work on with other people of note besides the service Tidal?
The promotion for the fragrances Usher He and Usher She featured musician Usher and Martha Stewart in a Macy's in The Magic of Macy's commercial.
Did musician Usher do any other commercials or televised appearances besides The Magic of Macy's commercial?
In 2013 musician Usher partnered with Samsung shooting a 2:28 minute short film directed by Rich Lee that included his single Looking 4 Myself from his then new album.
Are there any other interesting aspects about the article about musician Usher besides the commercials he appeared in?
In 2015 musician Usher teamed up with Pepsi for The New Pepsi Challenge along celebrities Serena Williams, Usain Bolt, and many others.

Question: What did he do for them?
Self-contained rewrite: What did musician Usher do for Pepsi' The New Pepsi Challenge in 2015?