Some additional information -
If you use separate names for each CD (like Bitches Brew CD1 and Bitches Brew CD2) MC will see these as two separate albums. MC looks at the tag Album Artist to determine if a set of tracks is one album. So, make sure that Album Artist is the same for all 6 tracks. That will combine all tracks into 1 album.
Once you have a common Album Artist tag, you can, optionally, specify the disc number for each disc. If you do not want to bother with disc number, just tag the tracks consecutively, for example as 1 to 6 for Bitches Brew. MC will then see this as 1 album with 6 tracks.
Alternatively, you can set the disc # tag to 1 for the first 2 tracks and to 2 for the last 4 tracks, in your example. If you do that, you can choose to number the tracks on disc #2 as 1 to 4, or as 3 to 6. Again album artist needs to be the same for all tracks. If you go this route, you should also display disc # in your views, especially if you number the second CD tracks starting at track 1.
Once you figure out that MC uses Album Artist to makes albums and how to use the disc # tag, everything should work.