Hi RB11rb1,
Thank you for your query to the Apple Community.
Seems your iTunes media library is now available in the Apple Music app,
Apple Support have articles online that may help:
What happened to iTunes? - Apple Support
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NB: To see detailed Apple Music "how to" articles, (eg: import music from other sources(
Click on "Table of Contents" at the top of the Welcome page that opens from the link
Apple Music User Guide for Mac – Apple Support
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Support websites:
iTunes - Official Apple Support
Music - Official Apple Support
All the best :-)