In this May 26, 2017, file photo, singer Steven Tyler performs during a concert of Aerosmith at the Koenigsplatz in Munich, Germany. Aerosmith singer Tyler says he has returned to the United States for medical care and the band is canceling the last four shows of its tour in South America. Tyler said on social media Tuesday, Sept. 26, 2017, that he flew back to the U.S. on Monday night after a show in Sao Paulo, Brazil. AP Photo/Lukas Barth, File)