The 33-year-old's lyrics are just as sweet as can be for her husband.
"I wake up just to sleep with you. I open my eyes so I can see with you. And I live so I can die with you," she sings in a home-made clip that shows them in a personal moment.
Jay Z, 45, launched Tidal on Monday along with 16 artist stakeholders including his wife, Rihanna, Kanye West, Nicki Minaj, Jason Aldean, Madonna, Coldplay and more.