Mexican musician Carlos Santana performs

Mexican musician Carlos Santana performs on the third day of Rock In Rio festival at Bela Vista park in Lisbon, 02 June 2006. AFP PHOTO/ JORGE PADEIRO (Photo credit should read JORGE PADEIRO/AFP/GettyImages)

Mexican musician Carlos Santana (R) perf

Mexican musician Carlos Santana (R) performs on the third day of Rock In Rio festival at Bela Vista park in Lisbon, 02 June 2006. AFP PHOTO/ JORGE PADEIRO (Photo credit should read JORGE PADEIRO/AFP/GettyImages)

English musician Roger Waters performs o

English musician Roger Waters performs on the third day of Rock In Rio festival at Bela Vista park in Lisbon, 02 June 2006. AFP PHOTO/ JORGE PADEIRO (Photo credit should read JORGE PADEIRO/AFP/GettyImages)

English musician Roger Waters performs o

English musician Roger Waters performs on the third day of Rock In Rio festival at Bela Vista park in Lisbon, 02 June 2006. AFP PHOTO/ JORGE PADEIRO (Photo credit should read JORGE PADEIRO/AFP/GettyImages)

British singer Elton John performs on th

British singer Elton John performs on the main stage of Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on May 22, 2010. Rock in Rio runs from May 21 to May 30. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

British singer Elton John performs on th

British singer Elton John performs on the main stage of Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on May 22, 2010. Rock in Rio runs from May 21 to May 30. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

British singer Elton John performs on th

British singer Elton John performs on the main stage of Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on May 22, 2010. Rock in Rio runs from May 21 to May 30. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

British singer Elton John performs on th

British singer Elton John performs on the main stage of Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on May 22, 2010. Rock in Rio runs from May 21 to May 30. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

People watch a fireworks display at the

AFP PHOTO / PATRICIA DE MELO MOREIRA

People watch a fireworks display at the main stage of Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on May 22, 2010. (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

North American singer Bruce Springsteen

North American singer Bruce Springsteen performs during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on June 3, 2012. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

North American singer Bruce Springsteen

North American singer Bruce Springsteen performs during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on June 3, 2012. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

North American singer Bruce Springsteen

North American singer Bruce Springsteen performs during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on June 3, 2012. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)

North American singer Bruce Springsteen

North American singer Bruce Springsteen performs during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon on June 3, 2012. AFP PHOTO / PATRICIA DE MELO MOREIRA (Photo credit should read PATRICIA DE MELO MOREIRA/AFP/GettyImages)