Transfer music from iPad's iTunes to MacBook's, devices have different iTunes accounts
The only way I know of to share iTunes content between multiple Apple IDs is their family sharing plan. My father and I use it to share movies and TV shows with each other. Apple gives instructions for setting up family sharing. While it is nice to share content, it definitely has drawbacks. The biggest is that there can only be one credit card registered to all accounts under a family plan. Hope this helps.