where is iTunes app on my iPad pro

.ITunes has been gone many years, at least 5-10. For music please use the Music app, for video use the TV app. Time to become familiar with IOS. /,iPad User Guide - Apple Support

You can find the iTunes store by following these directions.

1. Swipe to the right until you reach the App Library. Click on the search bar on the top, then search for the iTunes Store.
2. If you still can’t find it, you may have deleted it. In this case, enter the App Store to redownload it again.

Here’s a link for the iTunes Store:

https://apps.apple.com/us/app/itunes-store/id915061235

Hope this helps!