Conversation so far:
what is a charity John Mayer works for?
John Mayer has participated in benefits for the Elton John AIDS Foundation.
what does the Elton John AIDS Foundation do?
Supports innovative HIV prevention, education programs, direct care and support services to people living with HIV.
how does the Elton John AIDS Foundation raise money?
The organization supports its work through proceeds from special events, cause-related marketing projects, and voluntary contributions from individuals, corporations and foundations.
did the Elton John AIDS Foundation earn a lot of money?
It has raised over $400 million to support HIV related programs in fifty-five countries.

Question: what is a type of philanthropy he works with?
Self-contained rewrite: what is a type of philanthropy John Mayer works with?