Scottish singer Sheena Easton cherishes all the time she spent "making music and memories" with pop maverick Prince.
The pair collaborated on the hit song U Got The Look and Easton said those who became friends with Prince were "blessed".
Easton, 56, who cast aside her squeaky-clean image to feature on the 1987 track with the superstar, said he was "the epitome of a soul that came to us overflowing with love, and music, and light".
In a statement, she said: "It is such a sad day. I sit here trying to put on paper my thoughts about the sudden passing of Prince. It is impossible to sum up in a few neat phrases what his loss means to all of us.
"Prince has been described as iconic, innovative, controversial, unique, charismatic and one of the driving forces of music for the last four decades.
"Yes, he was all of those things, but he was also warm and generous, gentle and kind and when he chose you as his friend, you were blessed.
"Generous with his ideas and talent, he often wrote songs specifically for people whose work he admired. He was brimming with music he wanted to share with the world and so many artists and musicians have benefited from his vision.
"I was fortunate to have had the chance to collaborate with him, as you know, and I cherish all the times we spent together making music and memories that will forever be woven into the fabric of my career, and my life.
"I can't imagine Prince not being here. I just can't imagine it.
"His energy was so strong that he never seemed to age or tire like the rest of us. He was one of those people who confirmed my belief that we are more than just biology. We are spirit.
She urged people to listen to some of their favourite Prince songs, adding: "Be grateful, as I am that we are a part of the generation that got to experience the genius of this wonderful being who never was anything but exceptional."