In Apple Music the "Search" tab no longer gives the option to search Itunes music, only my library

Hey jarcardan,

We'd recommend reviewing this article as it may help to locate your iTunes music in Music on your Mac: What happened to iTunes? - Apple Support

"Upgrade your iTunes library

After you update to macOS Catalina, just open the Apple Music app or Apple TV app to use your iTunes library in the new apps. Have multiple iTunes libraries? Learn how to switch between them in macOS Catalina.

If you open the Apple Podcasts app or Apple Books app first, you won't see any of your media until you open the Apple Music app or Apple TV app.

Here are some things to know

• The Apple Music app and Apple TV app read the contents of your iTunes library — so don't delete your iTunes library.
• If you open the Apple Music app and don't see all of your album artwork, leave the Apple Music app open so your album artwork can finish downloading.
• If you previously used multiple iTunes libraries, your audiobooks are imported in to the Apple Books library and podcasts are imported in to the Apple Podcasts library on your computer.

Where's my media?

Here's where you can find your entire media collection, access your iTunes Store purchases, and synced libraries.

All of your music is now in the Apple Music app

The Apple Music app is where you can find all of your music, including music that you imported in to iTunes, purchased from the iTunes Store, and playlists and smart playlists that you created in iTunes. And if you subscribe to Apple Music, you can stream and download millions of songs, and access your entire music library across all of your devices.

Explore the Apple Music app.

Looking for the iTunes Store?

If you don't see the iTunes Store in the sidebar, here's how to find it:

1. Open the Apple Music app.
2. In the menu bar, choose Music > Preferences.
3. Go to the General tab and select iTunes Store.
4. Click OK."

If that doesn't help, we'd recommend contacting Apple Support for further assistance here: Get Support

Thanks!