There's a lot to love about the Seikilos Jazz collection and how it reflects characters' emotions. In the first iteration, there's a persistent raw loneliness but just a pinch of hope and comfort, which fits well with Asterion's first interactions with the Master. I love how as the Hotel begins to fill up and Asterion's strength and support system grow, so does the ensemble.
My personal favorite iteration, though, is probably the second one. If the first iteration reflects Asterion's initial state of mind, the second reflects the Master's. The piano has a lot of space there, and it usually plays when there's a lot of thinking and processing to do. The repeating, slowly shifting chords on the latter half really drive this home and empower these moments.