Ray Charles passed away in 2004, and while he was known for his live performances and many recordings, there is no mention of a Belgrade concert that year.
It is possible that you may have misremembered the details of the concert or the date, or there may be an error in the information you have.
If you have any further details about the concert, such as a specific venue or other artists who might have been involved, it might be possible to locate more information.