Lady Gaga's new song "Million Reasons" is number one on the U.S. iTunes music chart! The heartfelt ballad, co-penned with country songwriter Hillary Lindsey for Gaga's brand new album Joanne, has flown up the music charts following the singer's instantly-viral appearance on James Corden's "Carpool Karaoke" segment. Related: Watch Lady Gaga Join James Corden For 'Carpool Karaoke' "A-YO," the next pop radio release off of Joanne, is also enjoying a fast rise towards the U.S. iTunes Top 1