How to consolidate albums in my iTunes library?

I recently discovered that four tracks were missing from one of my Duke Ellington albums. I was able to find and download them from my Amazon library (where I had purchased the whole album) to my Apple/desktop Mac music library. Despite my best efforts to make the “get info” information for the four tracks and the remainder of the album consistent, the tracks remain separate in the Ellington artist section. 

Any suggestions on how to consolidate the album? 

What is really mystifying is that when I access my desktop library to play music on my TV with the Apple 4k TV device, the Ellington album has all of its tracks!!!! 

[Re-Titled by Moderator]