Conversation so far:
Who was the first person to help Sakis Rouvas?
Dakis, a popular Greek artist, was the first person to help Sakis Rouvas professionally.
Did Salis Rouvas move to another city in search for a better future?
Sakis Rouvas left Corfu at age 18, moving to Patras in search of a better future.
What did Sakis Rouvas do next, after moving to Patras?
After moving to Patras, Sakis Rouvas continued to look for performance opportunities until he met Dakis, a popular Greek artist who was the first person to help him professionally.
What did Dakis do to help Sakis Rouvas?
Which executive noticed Sakis Rouvas' showmanship at the Show Centre in Athens?
Sakis Rouvas' showmanship attracted the attention of music executives such as Nikos Mouratidis, who encouraged songwriter Giorgos Pavrianos to produce him

Question: Whose songs did he sing?
Self-contained rewrite: Whose songs did Sakis Rouvas sing?