عبد الحليم حافظ
Kaldas sang cover versions of songs sung by the Arabic Super-stars :Fairuz, Abdel Halim Hafez, Mohamed Abdel Wahab, Umm Kulthum, Nour el Hoda etc... and from the Worldwide he used to sing for Charles Aznavour, Édith Piaf, Mireille Mathieu, Frédéric François, Jacques Brel, Elvis Presley, Frank Sinatra, Nat King Cole, etc..