iTunes

Nailsnathan Said:

"iTunes: why can I no longer open iTunes on my MacBook?"

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iTunes is No Longer on macOS:

What is your macOS? Apple split iTunes in macOS 10.15 Catalina. So, if you have macOS 10.15 or thereafter, the TV app is used for Movies and TV Shows, where as the Music app is now for Music.

Go Here: What Happened to iTunes? - Apple Support

Nailsnathan Said:

"iTunes: why can I no longer open iTunes on my MacBook?"

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Find your macOS Version:

1. Go to: Apple menu
2. Select: About This Mac
3. View: Second-Line Down(The version of your MacOS)

Does it read: Version 10.15 or Version 11 or thereafter? If so, iTunes is not an option for your macOS.