 " Mr. Bellamy " , the sixth song on the album , was thought by online fans to be about McCartney 's then @-@ recent divorce . McCartney invited <unk> frontman Thom Yorke to play piano on the song , but he declined . The press ran articles claiming that Yorke had " <unk> " McCartney , but Yorke later revealed that he " really liked the song " but felt he would be unable to perform to the required standard . " Gratitude " is reportedly about the divorce between Heather Mills and McCartney . 
