Pop icon Britney Spears recently addressed a question regarding the amount of live vocals used in her Las Vegas show while in Tel Aviv and she said that it really pisses her off!
You'll recall her tour manager Adam Leber addressed the same issue back in 2014 with this statement:
"To put on the show that she puts on, it's virtually impossible to sing the entire time and do what she does. She's singing on every song, basically, when she has the ability to sing. There's no way you can dance for 90 minutes straight and sing the entire time."