Quincy Jones spoke to BBC Wales' Penny Roberts in Cardiff about Michael Jackson's death.
Michael Jackson's music producer Quincy Jones has spoken of how the singer's death does still not feel real to him.
On a visit to meet students at the Royal Welsh College of Music and Drama in Cardiff, Jones said: "I still don't know how to process it".
"It's too surrealistic for me. I was 50 years of age when I produced Thriller, his age," said the 76-year-old.
"I'd never in the world, in my wildest nightmares, dream he would leave before me," he told BBC Wales.
He said the two of them "had so many experiences together" and the singer's death was "hard to believe".
"I was in London when they announced the 50 concerts [planned for the city's O2 Arena] had sold out in four hours.
"He was going to bring the kids over and I had a dinner that night, so I said 'I'll see you in Los Angeles', and I never saw him again."
"He's like a part of my soul. I can't help it, that's the way it is. He's my little brother that's gone," added Jones.
Jones, who also produced Jackson's Off The Wall album in 1979, said the star was among the best entertainers the world had seen.
"He was one of the very best in every way. Songwriting, his performances, his dancing, singing, everything," he said.
"We were very close. The relationship between a producer and an artist is one of love and it's trust, tremendous trust."
Asked about Jackson's "complex character", Jones responded that all entertainers had that type of personality.
He said: "Entertainers are complex. Which one do you know who isn't? Madonna is the girl next door?
"They are all complex. That's what makes them what they are.
"I come from a very irregular background. You might say if that hadn't happened I may never have been a good musician. I'll never know."
On his visit to Cardiff, Jones heard music students perform and said they were "some of the finest musicians" he had come across.