
Madonna returned to the U.S. on Tuesday after a European tour and told the audience in Philadelphia that they should “never forget how lucky you are to live where you live and to have the freedom that you have.” (Keystone via Associated Press)

Madonna returned to the U.S. on Tuesday after a European tour and told the audience in Philadelphia that they should “never forget how lucky you are to live where you live and to have the freedom that you have.” (Keystone via Associated Press)

** FILE ** In this April 25, 2010 file photo, singer Whitney Houston performs at the o2 in London as part of her European tour. An autopsy report shows that cocaine was found in Houston's system and that investigators recovered white powdery substances from her hotel room. Houston died Feb. 11, in California at the age of 48. (AP Photo/Joel Ryan, file)

FILE - In this July 2, 2009 file photo, Bruce Springsteen, right, and the saxophonist Clarence Clemons, left, perform during his first Germany concert at his "working on a dream" European tour in the Olympic stadium in Munich, southern Germany, A spokeswoman for Bruce Springsteen and the E Street Band says saxophone player Clarence Clemons has died in Florida at age 69 on Saturday, June 18, 2011. (AP Photo/Christof Stache, File)

U.S. President Barack Obama and first lady Michelle Obama during their visit to Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

U.S. President Barack Obama and first lady Michelle Obama meet local residents in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

U.S. President Barack Obama meets local residents in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

President Barack Obama, left, holds and swings a hurling stick as Ireland's Taoiseach Enda Kenny, second from left, looks on he and first lady Michelle Obama leave Farmleigh House after after a visit in Dublin, Ireland, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse.(AP Photo/Carolyn Kaster)

U.S. President Barack Obama and first lady Michelle Obama disembark from Air Force One as they arrive at Dublin Airport to begin a 24-hour visit to the Republic of Ireland, in Dublin, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo/Matt Dunham)