Aaliyah would have been 13 or 14 at the time.

On a separate stop in Washington, D.C., during the tour, Angela recalled that she and a group of other girls including Aaliyah were reprimanded for breaking the singer’s instructions. Angela told jurors that they had made a trip to a 7-Eleven convenience store for food, but that Mr. Kelly had told them not to leave their hotel. When he learned of their disobedience, he demanded sex, she said.

“Robert told all of us we would have to put out,” she said. “It was dues time,” she added, explaining to jurors that the singer often presented having sex with him as a form of paying their dues.

Angela said that she refused the singer’s advances. While Aaliyah was among the girls that Mr. Kelly had addressed, she was not aware whether the two had sexual encounters immediately following that incident.

Alex, the male accuser who appeared on Monday, also testified to “countless” sexual encounters with the R&B superstar and other women at Mr. Kelly’s direction.

He testified that for more than a decade he often saw the singer at parties and pickup basketball games — what he called “Kelly ball,” in which “you’d get the ball, rebound, let him shoot” — at a recreational centre and a church gymnasium in Chicago.

Mr. Kelly first made an advance on him inside the singer’s Maybach, when Alex was about 20 years old, he said. “I recall him just talking to me, then forcefully kissing me, licking my face,” he said, adding that afterwards, Mr. Kelly told him “just to be open-minded.”

During sexual encounters with Mr. Kelly, he said the singer referred to him as “nephew,” although, Alex testified, they are not related. He said he was directed to call Mr. Kelly “Daddy.”Sometimes afterwards, he said, Mr Kelly would “slap $100 or two in my hand just for gas, my time.”

But it was Mr. Kelly’s interactions with Aaliyah that began to focus public scrutiny on accusations of sexual misconduct by the singer.

In the mid-1990s, Vibe magazine reported the details of the fake identification that was procured so Aaliyah could marry Mr. Kelly in 1994. Witnesses have said that the union came about because Mr. Kelly believed that Aaliyah may have been pregnant and feared that he could be prosecuted for statutory rape.

And as Mr. Kelly’s conduct came under renewed scrutiny at the height of the Me Too movement, both instalments of the “Surviving R. Kelly” documentary series delved into the accusations.

“If people would have protected Aaliyah, so many other girls wouldn’t have gotten touched,” a former boyfriend, Damon Dash, said during the second portion of the Lifetime series. “Aaliyah was like the sacrificial lamb for all that.”

Several witnesses during the trial have testified about other aspects of the encounters between Mr. Kelly and Aaliyah. The minister who married the two spoke publicly for the first time earlier this month, telling jurors that he was asked to give his word that he would not discuss their 10-minute wedding ceremony at a Chicago-area hotel.

And one of the singer’s former tour managers, Demetrius Smith, testified that he bribed a government employee for the fake identification for Aaliyah as Mr. Kelly’s inner circle began to plot the marriage.

The union was annulled in 1995, and Aaliyah filed to have details of their union expunged from her record two years later. Her subsequent albums were produced without Mr Kelly.

During his testimony, Mr. Smith described the first meeting of the two singers in 1992. He said they began working on her music together and appeared to be “more than friends from the very beginning,” though he said he first viewed their interactions as a uniquely close working relationship.

But over time, the friendliness of their exchanges began to raise concerns, Mr. Smith told jurors.

“At times, I was concerned,” he testified. On at least one occasion, Mr. Smith said, their behaviour had prompted him to ask, “Robert, you ain’t messing with Aaliyah?”

Mr. Smith said he meant “flirting, being flirtatious. Seducing her.”