Possible Clues:

• One-named musician whose last name is Chryssomallis
• Greek New Age pianist
• New Age musician with the platinum album 'Tribute'
• One-named Greek-born soft-rock musician
• "Live at the Acropolis" performer
• Keyboardist who concertized at the Taj Mahal
• One-named Greek New Age musician
• One-named Greek keyboardist
• "Live at the Acropolis" keyboardist
• "Live at the Acropolis" new age pianist