I do not know if the Current MacOS Music App can support multiple libraries like iTunes did (up to v12.x).
If it can, move the current library to an external drive.
You did not mention if you have AppleMusic, but if you do, you library should be in the cloud.
If you have iCloud, you can keep your photo libary in the cloud as well.
If no to both or either of these, then definitely get the the adapter anonymous mentioned, with a 1TB microSD card.
[
www.amazon.com]
San Antonio, TX (in the old city)
"All that is required for evil to prevail is for good men to do nothing." - Edmund Burke
“Neutrality helps the oppressor, never the victim. Silence encourages the tormentor, never the tormented." - Eli Weisel
"To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public." - Theodore Roosevelt (1918)
"I don’t want to see religious bigotry in any form. It would disturb me if there was a wedding between the religious fundamentalists and the political right. The hard right has no interest in religion except to manipulate it." - Billy Graham 1981
"Politics and governing demand compromise. But these Christians believe they are acting in the name of God, so they can't and won't compromise" - Barry Goldwater