For the first time since 2013, the five living former presidents appeared together at a concert Saturday night to raise money for hurricane victims.Democrats Barack Obama, Bill Clinton and Jimmy Carter and Republicans George H.W. and George W. Bush were on stage in College Station, Texas, to try to unite the country after the recent storms.The concert at Texas A&M's Reed Arena was to raise money for the victims of Hurricanes Harvey, Irma and Maria.Texas A&M is home to the presidential library of the elder Bush. He has a form of Parkinson's disease and appeared in a wheelchair at the event.Grammy award winner Lady Gaga made a surprise appearance at the concert. She tweeted: "Nothing more beautiful than everyone putting their differences aside to help humanity in the face of catastrophe. #OneAmericaAppeal"The event also featured country music band Alabama, Rock & Roll Hall of Famer "Soul Man" Sam Moore, gospel legend Yolanda Adams and Texas musicians Lyle Lovett and Robert Earl Keen. Country music singer Lee Greenwood was the concert's emcee.President Trump was not in Texas for the event, but as The Associated Press reports: