Q: What happened to iTunes on my Mac?

Tried this solution using Terminal, but Terminal asked for a password.

I assume it was my MBP admin password, but it did not work :-(

Fred Davenport: Did you also try the method outlined by Linc Davis earlier?  Both essentially do the same thing in deleting the iTunes application, one just uses command line to override the file permission and the other has you change the permission in Finder.

Apr. 2015 Niel post: Re-install iTunes application - https://discussions.apple.com/message/28055467#28055467 - delete the old application first, with instructions on how to do that. 

April 2015 LincDavis post with a bit more detail on the method Niel outlines - https://discussions.apple.com/message/28101611#28101611

A similar technique by Ben.d using Terminal to delete the application - https://discussions.apple.com/message/28036630#28036630