Henry Mancini tracks. What a great movie composer. We have a friend who gives us obscure Henry Mancini recordings and as much as we love Pink Panther and stuff like that, he's is so much more than that -- for example, the tracks from the Peter Gunn TV show equaled and excelled the more well known theme music.
Right, you had a question(s). Yes, you can use the compulsory notice for music that includes some improv and personal progressions. It's true that major revisions to a song require permission, but practically, publishers don't really care about what you do between the grooves provided you pay the toll (9.1 cents per track).
As for your second question. If you're using two tunes on one track, you have a few choices: you can pay both publishers 9.1 cents (again, they won't care what you're doing); you can pay only for the dominant/primary tune that you're using and hope that the other publisher doesn't hear (or care) about your "quoting" of the melody. (The other publisher is unlikely to learn of it unless the title is included in the CD notes -- for example, "Track 5: Charade/Chim-Chim-cher-ee.") And finally, you can try to negotiate with both publishers for a lower rate (probably a waste of time unless you're a major label.) We think you're probably fine with the second choice.
And your third question. The compulsory license is for nondramatic uses so your use on a CD would qualify. A dramatic use would be if you wanted a license to perform the music publicly as part of a show.