What happens to the 40 songs Bruce Springsteen didn't use on his new album?

Bruce Springsteen has released a very different collection of songs on his new album,  Only The Strong Survive.  It's a beautiful musical love letter to artists and songwriters who have influenced and inspired him over the years.  He is also about to embark on a HUGE tour around the States and Europe in 2023, how on earth does he decide what to sing and what not to sing?  I was lucky enough to sit down and chat to him at length about his incredible stamina and creativity that thankfully for us fans, doesn't seem to be diminishing.