With the story being more focused on the mandalorians, Joseph Shirley is able to play around with many of the different established ideas for the main character, Grogu, Bo Katan and the Mandalorian Culture as a whole. During the opening training scene we hear several arrangements of the A theme for the Mandalorian Culture, with the B theme making a small appearance joined with the A theme in a later scene, as well as some hints of the Rhodes motif, supporting Grogu's first training. 

It's interesting to note that when Grogu's challenge begins, we hear traces of another theme that will come back in its standard form later in the episode. The Forge theme was used through Season 1 to represent the character of the Amrorer and to underscore Din's flashbacks, but was also used as a sort of action motif for the mandalorians at one point in episode 3. Here we hear it first as a fast-paced string ostinato for Grogu's training, but then a more reflexive variation as Bo Katan and The Armorer talk, near the end of the episode.

We also hear a brief hint of a lovely melody, the Mando & the Child theme, which has been used sparsely through the show to represent the emotional bond between these two characters, and here it plays briefly on strings when Grogu defeats the mandalorian kid's challenge.

Apart from those themes, unheard so far in Season 3, the composer also brings new variations on already heard themes, and there are some cool variations on the Mando Heroics theme (already heard in the previous episode) and on Bo Katan's material. Her sound motif plays as she chases the monster, and we get a softer variation on her main theme right after the characteristic title card with the western motif. A similarly noble and soft variation plays when they are camping during the night, right before entering the creature's nest to rescue the foundling.

There are also some interesting new appearances of that theme I already mentioned since episode 2, that at first seemed like a theme for Mandalore, but that it's slowly establishing itself as a new identity for Bo Katan, representing her redemption and acceptance journey through this season. In the episode we hear it a couple of times during the action sequences with the flying dinosaur-like creature, as well as right before it when the group arrives near the creature's lair. But there's another appearance near the end of the episode that further cements my idea that is a sort of Redemption Theme, as it plays when Bo Katan asks the Armorer about the Mythosaur she saw under the Living Waters of Mandalore.

This final scene has another cool easter egg hidden in there, and it's the melody that plays twice, when Bo Katan mentions the mythical creature, and that's no other than the Mythosaur theme that played during the final sequence of episode 2, when Bo Katan sees the Mythosaur herself under the water. It's now established as a theme that represents this ancient creature, and it's a nice little nod that shows the clever scoring on Shirley's part!

But the big revelation is that he was rescued from Order 66 by a jedi called Kelleran Beq (played by no other than the great Ahmed Best!) and this leads to an exciting action sequence where the jedi master helps Grogu escape Coruscant safe and sound. Shirley composed some cool action passages for this part, and there are repeated statements of a sort of heroic theme, that I think could be a representation of Jedi Master Kelleran Beq.

It's soon to tell, but the theme has quite a few different arrangements during the lengthy action sequence, and if we keep seeing more Grogu flashbacks, we perhaps might learn a bit more about his past, and about this mysterious Jedi Master, and perhaps the composer will bring back this theme to represent the character.

But for that, we have to wait at least another week until the next episode!