Two new live albums by Nina Simone and Etta James are being released by the Montreux Jazz Festival and BMG.

The newly issued recordings are the first releases in a new series called The Montreux Years, which collects rare, previously unreleased performances from the festival’s 55-year history.

Nina Simone: The Montreux Years and Etta James: The Montreux Years will both be released on May 28.

The Nina Simone collection features recordings from her festival performances in 1968, 1976, 1981, 1987 and 1990, and the double-CD version includes the full 1968 performance for the first time. The Etta James album features her sets from 1977, 1978, 1989, 1990 and 1993, with the double-CD version including her first European appearance in 1975.