Short answers, pulled from the story.
The Three Tenors performed their first concert together on the 7th of July 1990 inside the ancient Baths of Caracalla in Rome, Italy. This event was organized to raise money for José Carreras's leukemia foundation after he underwent successful treatment for his illness.
Zubin Mehta conducted the orchestra during The Three Tenors performances in 1990 and 1994. James Levine led the orchestra for the Paris concert held in 1998.
The original Carreras-Domingo-Pavarotti album became known as The Three Tenors In Concert and holds the Guinness World Record for best-selling classical music album. A filmed version produced by Herbert Chappell and Gian Carlo Bertelli for Decca also achieved this record status.
Their final performance together took place at the Schottenstein Center in Columbus, Ohio on the 28th of September 2003. This event marked the end of a career spanning from 1990 to 2003 that included three further FIFA World Cup Finals.
Years later his former agent and manager Herbert Breslin wrote that Pavarotti had indeed secretly received $1.5 million that the other two tenors did not receive. For subsequent concerts and recordings, the singers were much more careful in assuring financially advantageous contractual terms for themselves.