Coltrane played on that album, of course, and it greatly influenced his own style on subsequent work, including “My Favorite Things,” which he initially recorded the following year.

Pantonality and atonality are specific terms that clearly do not describe Coltrane’s music, but modal jazz is a broader, and different term. Some modal jazz may be pantonal or atonal, but modal jazz as it’s most commonly understood is this earlier form.

http://www.modaljazz.com/what.html

so that’s it. modal is atonal.

In the case of “My Favorite Things,” as Coltrane plays it, there’s a bit of a mix of modal harmony and more traditional harmony (even though it’s been altered from the original to be “more modal,” if that makes sense), with the traditional harmonies occurring in the “head” and the modal harmonies happening during the extended solo sections.

Ultimately, modal harmony in jazz is really about the melody — a modal chord progression allows the soloist to move around freely within a single set of notes (since the scales of the different chords share the same key signature), to some extent disregarding the chord changes altogether, but also interacting with them in new and less predictable ways. Here’s a great link for more:

http://www.modaljazz.com/theory.html