How to transfer music from my computer on itunes to my iphone?

I transferred music from my itunes account onto my dads iphone, but for some reason it won't work for my moms iphone. I need help!

Plug your phone in to your computer using your charging cord open itunes ( computer should automatically connect to itunes and should open bye itself ) create a new
Playlist add music and drag it to your iphones info and in the music option. Hope this helped!

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Let us know if it is what you want.

For some reason you asked this question but said nothing about how you tried to put music on your mom's phone. The likely answer is that you did it wrong, but it's hard to say otherwise or what you did when you don't say anything at all. It's not technical - just common sense.

Try setting for manual management of music and video in iTunes (on the computer) and then just drag and drop files to the iPod tab on sidebar.