Non-music recordings on iTunes not available now on music app on Macbook

Is this an upgrade to Monterey from Mohave or earlier on the same computer, or a migration from another? See What happened to iTunes? - Apple Support. Audiobooks, podcasts, voice memos, and tones, are not catered for in the new Music app. Video content has been moved to the TV app.

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If you migrated the library as a whole then Music should have all the same music content as the iTunes library it was derived from. If you imported the content into a new empty library then any untagged music, typically .wav files, would have imported as Unknown Artist/Unknown Album. In the Songs view of the library use View > Show Filter Field to enable a better search function. Type in part of the title of one of these recordings and see if anything shows up. If not you should be able to copy over the files manually and add them to your library.

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Do you still have the 10 year old iMac, a backup of it, or any other device that holds this content?

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Great, so what content is that you're missing on the new machine?

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