Well, that was totally UNHELPFUL! You obviously did not even bother to READ my post so I'll copy it here and highlight the information you need to be able to answer me:
Subject says it all. I've tried it on my iMac (mid-2011) and on my MacBook Air (mid-2011) both have MacOS 10.13.6 and iTunes 12.6.5.3 and I CAN'T use later versions of either one.
Your post sent me to instructions that are NOT germane to my question:
- They cover MacOS 10.15 and 11.0 neither of which will run on my iMac or MBA. (See last sentence of the repost above). BTW, there ISN'T a "Music" application in MacOS 10.13.x
- Selecting the item and clicking the delete button does NOT work. This is WHY I asked for help.