How to manually add songs onto my iPhone if it contains songs from 2 libraries?

I bought an iPhone last November and synched it to the iTunes on my parents' computer. When I left for college this August, I bought a MacBook Pro and installed it with my Apple ID. My Apple ID is different from the Apple ID of my parents' computer.

Since my phone's music library is synched with my parents' computer and contains songs that I did not buy with my Apple ID, iTunes will not let me manually add songs to my phone without erasing its current music library and synching it to my purchases on my Apple ID.

Can I avoid this? The majority of the songs on my phone are from my parents' iTunes and I'd rather not lose more than half the songs on my phone.

Unfortunately, I don't think this is possible. The same thing happened to me when I left for college this past summer. You should ask your parents for their Apple ID. This is the only possibility I can see for you.

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