TheSingingMixer: #AGreatBigWorld & #ChristinaAguilera teamed up to make #SaySomething a beautifully tragic #BreakupSong. @TheHippo crafted a richly emotional #piano #StringPad #cover & I felt lucky that @Rebecca S. had #collab’ed in, so I could sing #lead to her gorgeous #Christina #Harmony! Feel free to take over either of our spots if you want to #joinmycollab! #Xtina #tsm #mrs #hpo