What does the man probably do for a living?

W: Hi, Howard．What are you working on now?
M: Hi，Lisa．I’ve just finished a piece of background music．
W: Background music?
M: Yes．Like the music they’re playing here now．
W: Really, I didn’t notice it．
M: You are not supposed to notice it．It’s just there，in the background．It’s supposed to influence your attitudes，put you in the right mood．
W: I’m not sure I like that idea．
M: Well．it seems to work．Companies pay millions of dollars every year for background music．
W: I should think they’d get sick of hearing music all day．
M: They don’t．though．
W: Do the restaurants play the music for dinner and lunch?
M: I don’t know about that，but I do know that hamburger places play fast music． When they started playing faster music．they found that a customer spent only seventeen minutes eating．The time was twenty-two minutes before that．
W: So they have more people coming in and out to buy hamburgers．
M: Exactly…