Will updating itunes delete all my music?

So no i have not updated to 11.2.2 i think it is now. I'm still on ios 7.1.1 i have and iphone 4 no siri 8gb. I take all my music from youtube ik ik its wrong but hey most of the music i like is not on itunes. Anyway if i update itunes and my phone will it delete all my music?
is there a way i can save all of it from ever being wiped out? I have an external hard drive but i don't know how to get everything on there at once without skewing something up, plus lot of my music is Russian so the letters don't convert and the names are like in under scores which i change once i put it into itunes but it dosnt change the download name; its really annoying so id like to take the song directly from itunes to the drive so i don't know how to do that or i just to afraid to try.

Updating will not delete your music