Beach Boys singer Brian Wilson has been personally telephoning fans who pledge more than $100 (£56) to the Hurricane Katrina relief efforts.
Wilson was a founder member of the Beach Boys
The star called up one fan who doubted Wilson's involvement in fundraising and challenged him to call him to prove it.
"So I called him up," said Wilson, before promising to call up other fans who made similar donations.
He will also match donations of more than $100 until 1 October, with money going to the American Red Cross.
"If we get $10,000, we'll match $10,000," he said.
So far, Wilson, along with wife Melinda, has called up at least 15 fans who donated through his website and has a long list of others to ring.
New Orleans was devastated by the impact of Hurricane Katrina
The 63-year-old said it was "heartbreaking" to see the devastation to Louisiana and Mississippi, having performed at the New Orleans JazzFest earlier in the year.
"I have rarely felt so welcomed in such a wonderful community that has given so much music to so many of us," said Wilson.
Wilson has just completed a US summer tour, following on from his highly-praised performance at the UK's Glastonbury Festival.
He was also one of the musicians who took part in the Re:Act Now benefit concert in Hollywood, raising money for charities supporting victims of the hurricane.