I'm having multiple problems with iCloud/iTunes?

First of all, I changed email addresses, so I changed my apple id. However, my icloud is still using my old apple id and i can't figure out how to change it to my new apple id. My phone keeps telling me to enter my icloud password for my OLD emai address, but A) I don't remember my old password and B) I want to use my new apple id. Help Please!

Second, icloud has put some music in my itunes on my phone that i would NEVER listen to! How can I get rid of those songs?

Third, I have some songs on my iPhone that are not on my laptop and some on my laptop that are not on my phone. When I try to sync, it looks like some will be erased. How can I make all the music the same on both devices without losing anything?

Fourth, my phone won't back up. It keeps telling me I don't have enough storage in my iCloud. I do not want to purchase my storage. I tried putting my pictures onto my laptop, but I don't think it worked. I'm so confused.

If you can help with these questions, I sure do thank you!

Check the link below for changing an apple id. Too late now but it would have been more effective to simply change your email address on your apple account instead of changing the Apple id.

You need to work with the iCloud music to be certain it is the mirror of what you are wanting and than you need to sync both your system and your phone to the cloud. See second link for deleting from the cloud which is where your iPhone unwanted music should have loaded from.

For backing up your iPhone change your preferences on your computer within in iTunes to back up to your computer.

Don't sync your iPhone to your computer until the exact music setup you want is in the cloud and on the computer.