where is itunes / apple music located

I have I-Tunes ( apple) operating on my windows PC., I have a paid subscription monthly.
If I go to iTunes on my PC windows 10 , it opens and displays all my saved music( 3000) and others to view if interested. On my amazon/echo smart-speaker- when 'activated with the words' .. " Play Terry's music" it 'will find and play the music I have on I tunes under "Terrys Music", BUT if I say 'Play MY Music' it plays a whole bunch of Great tunes and songs .. but I don't know where they are located within I tunes. I even have an artist or two WHICH is found under I tunes 'search' but only within its own I tunes catalogue, not mine ( saved) .. ?? what am I doing wrong for finding the search for Play MY Music.?

Just to clarify, the "My Music" you are referring to is what Amazon Alexa thinks is "My Music" when you ask it to play "My Music".

If this is correct, then it may be somewhat difficult to determine what the HAL 9000 err... Amazon Alexa considers "My Music". It may not be from iTunes, or anything that you have associated with your music at all, unless there is a way for you to specifically associate the "Play My Music" phrase with something when using Alexa and you have actually made that association.

iTunes or Apple Music depends on the operating system you're using. Here's where you can find them:

On macOS:
macOS Catalina (10.15) and Later:

iTunes was replaced by Apple Music.
You can find Apple Music in your dock or by searching for it using Spotlight (press Command + Space and type "Music").
Open Finder to manage devices like iPhones or iPods connected via USB.
macOS Mojave (10.14) and Earlier:

iTunes is still available and located in the Applications folder.
You can also search for "iTunes" using Spotlight.
On Windows:
Download iTunes from:
The Microsoft Store (on Windows 10 or later).
Apple's official website if you're using an older Windows version.
Once installed, you can find iTunes in the Start Menu under "All Apps.