Gates said that Irish rocker Bono was staying with him and that the two hung out together after the concert in Seattle. The executive and the city are also playing host this week to a decidedly more business-oriented event, Microsoft's .
The Bill & Melinda Gates Foundation, with an endowment of $28 billion, is the world's biggestand aims to improve the health of people in the developing world.
"We're big believers that more needs to be done in developing countries," Gates said. "Let me tell you, Bono has had a huge impact."
Bono is a vocal advocate of Third World debt relief, and Gates' foundation has given out more than $4 billion for global health since its inception to fight diseases such as AIDS and malaria.
Asked if their friendship would entice him to buy one of Microsoft rival Apple Computer's, Gates said: "Absolutely not."