My girlfriend has an old iTunes/iCloud account with a lot of music she ripped from CDs she owns, and a lot of music she bought through the iTunes Store. This old music is also on an iPod classic (but she upgraded to Catalina).
A few years ago she created a new account, and has been building a library of music there too.
Looking for suggestions on getting the drm music she owns from the old account to the new account. I know this was done in the past by burning a CD, then importing, but those are bygone days.