That is the paradox. Hamas has provided the formerly lawless Gaza with security, which won the party the election over Fatah. But Hamas now makes many Gazans feel insecure. Majeda Alsaqqa is the woman running the Culture and Free Thought Association, the one held at gunpoint. For the moment, she’s back in business. But Hamas not long ago took over the local library, and it stages plays about the lives of Palestinian soldiers killed by Israel, which are sometimes performed in the street just outside Ms. Alsaqqa’s garden.

“They use real explosives!” she said, laughing. “It used to be different here. I used to ride around on a bicycle wearing a dress. The raid on us was about imposing a different culture  about not liking our kind of theater, where men and woman mix. These were brainwashed kids who came with the Kalashnikovs, who are taught not to like foreigners or summer camps, where we teach children not to take anything for granted. For the first time, I’m scared.”

She’s not alone. Even so, Gazans can be stubborn. These days, playing songs extolling Fatah in public is a direct provocation against Hamas. The other night, a Fatah anthem sounded through the streets. It turned out to be a bachelor party. A rented bandstand with flashing lights had been erected in a square.

The men, heads skyward, danced with a mad intensity, escaping into the deafening music. The inky sea was up the street, silent and shimmering. There was no traffic, no movement on the sidewalks otherwise, but at the end of the block, several young, armed Hamas soldiers lingered in the shadows.

“You never know,” said Mr. Kihail, back at New Sound. “No direct threat has come, but you cannot joke with Hamas.” Next to the cash register  beside tapes bearing an image of the long-faced, white-bearded Hamas founder Ahmed Yassin  he nonetheless still stocks Fatah tapes with pictures of Samih Madhoun, the fighter whom Hamas last year elaborately executed. When asked to play a selection from the tape, Mr. Kihail kept an eye on the door.

“Arafat, you left,” the singer wailed, “but you left behind an earthquake that is Samih Madhoun.”

Just then, a middle-aged woman in a head scarf wandered in, and fondled a CD by Mustafa Amar, an Egyptian singer in a dashing white scarf, standing before the Pyramids. “It’s an escape,” she said, making clear she meant the music, not the album cover. Mr. Kihail asked her if she was also a fan of Abdel Halim, the Egyptian crooner, who died in 1977 and who remains universally beloved here. He cued up a Halim song, one about a man abandoned by his lover, with a baleful melody. She nodded. Briefly, Mr. Kihail teared up.

“I blame him,” the woman said, about Halim, “for being so romantic. Life is not like that.”

“No,” Mr. Kihail said, “it isn’t.”