mozart
Palestrina
Guillaume de Machaut who wrote The Notre Dame Mass around 1360-1365.
Harry is being stalked by the man believed to be the mass murderer responsible for his parents' death.
Johann Sebastian Bach (1685-1750)
palestrina? im not 100% sure though
The effect of mass extinction is extinction, death of a mass
Requiem Mass
It is believed that Jesus was born percisely at midnight.
I assume by "mass songs" you mean simply "masses" or "settings of the Mass Ordinary." In that case, Giovanni Pierluigi da Palestrina is a good answer. He wrote more masses than anyone.
The British unit of mass is the slug.It is NOT the pound, as is commonly believed. A pound is a measurement of weight, while a slug is a measurement of mass.
Death camps were a simple way to do mass murders.
40: 40Ca is an alternative method of writing calcium-40.