So these CDs have not been ripped to another PC or Mac into iTunes? If so, then your only possible solutions are to rip these CDs directly into iTunes on the MacBook Pro (assuming it's the retina version since those don't include optical drives) using an external CD drive or rip them onto another PC or Mac with an optical drive and then use an external hard drive to copy them over to here new MacBook Pro.
Thanks for your reply!
Actually, many of the CDs have been ripped into iTunes on my old iMac (2004, running OS X 10.4), which is still a viable machine (I still record with it), but the OS is incompatible with the newer versions of iTunes. In fact, the iTunes store doesn't even acknowledge that I have a legitimate copy of iTunes. So practically the only thing I can do with that iMac is transfer music into its iTunes library from sources like CDs.
The MacBook Pro I have is the retina display version, so buying the Super CD drive would be the way to go.
But your reply also hints at another solution that I had not considered:
I do have a external G drive with lots of capacity still. It does have a USB 2.0 port which works with the 3.0 ports on the MBP. I suppose I could transfer the iMac library contents as MP3s onto the G drive, and then load those into the iTunes library on the MBP. Would that work?
I think I may still get a CD/DVD drive for the MacBook, but this manual transfer may at least be a workaround of some kind.
Thanks again for your help.