lost old e-mail address can't login to itunes

I can't login with the old e-mail address becasue it is gone

Have you check your mail box?

Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

If you forgot your Apple ID email address or phone number - Apple Support                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

See -> If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

It appears I have a common problem, I have a new apple I’d and password but all my music is under an old email address which is not active or available to me how do I get my stuff on my new apple account