Sir Elton John called for the US government to carry on funding research into HIV/AIDS during a special meeting in Washington, D.C. on Tuesday.
The Crocodile Rock hitmaker, who set up his own charity to help raise awareness of the disease, is in the capital for the International AIDS Conference, which he spoke at on Monday.
Sir Elton continued his efforts at an event on Capitol Hill, urging senior members of Congress to keep money flowing into the global effort to combat the condition.
He told guests, "I beg the Senate to maintain its funding. You are the country that everyone looks to. Do not take your foot off the accelerator, finish this job.
"Look at how far we have come. The feeling in this room today... is like the great feeling of the sixties. It's so apparent there is such love in this room. What we have here is the human spirit... the power of people working together for good is an unstoppable good."