Federal prosecutors in New York recommended that disgraced R&B singer R. Kelly be sentenced to more than 25 years in prison, citing his “decades of crime” and a “callous disregard for the very real effects that his crimes had on his victims,” according to a sentencing memorandum filed Wednesday.Federal prosecutors in New York recommended that disgraced R&B singer R. Kelly be sentenced to more than 25 years in prison, citing his “decades of crime” and a “callous disregard for the very real effects that his crimes had on his victims,” according to a sentencing memorandum filed Wednesday.