"You listened to Tosca over and over"

Tosca is an opera by Italian composer Giacomo Puccini (1858-1924).

This is referred to again much later in the book (page 896 - "There is no music for free-floating misery like Tosca") just before Hal's facade of emotional antipathy (prompted by his father's death and sustained through years of drug-use) finally slips, and he feels "some variant of the telescopically self-conscious panic that can be so devastating during a match."

Listen on Spotify:

Vissi d'arte from Tosca

An Introduction To...Puccini Tosca: Historical Background To Tosca