Possible Clues:

• Memento ___
• Doom metal band Memento ___
• Flyleaf "Memento ___"
• Muriel Spark's 'Memento '
• The Streets "Memento ___"
• See 28
• Memento __: reminder of mortality
• The Agonist "Memento ___"
• They organise poll of editors leaving dormitories
• Patti Smith "Memento ___"