How can one define a piece as being life changing? There are some pieces which are extremely close to my heart, yet I'd be reluctant to say any of them truly "changed my life".
It's difficult to define in words, of course, yet for me there is a definite difference between recordings and performers and pieces that I enjoy and even love, and then those who have actually changed my life (yet I may love these, too). For it to change my life, I experience it as a particular connection which goes beyond sound, though obviously sound is there, too. But, I feel a connection with the performer in a way that is something like seeing through their own eyes, and almost as though they are also seeing through mine, as well. Every one on my list above has changed my life and in some ways it's been a similar kind of fundamental experience with each, but some have intoxicated me much more than others.
I once said to a friend "You know when somebody just comes along in your life and then everything is just different, like they've somehow just changed your entire life just because you met them (...)" and I was going to continue, but she said "no, I don't."

I guess some people experience this and others don't. I've definitely felt like meeting particular people have changed my life

. Of course, that doesn't mean life is over and there are no more challenges, but there's been something about meeting particular individuals ...