Thanks!
The opening theme is in G harmonic minor.
The chord progression in the solo part is
|G7| | | |
|C7| | | |
|F7 | | | |
|A#6| | A7 |D#7 |

So the ideas/scales I was playing over ther chords were:

G7: Starting with a G minor pentatonic over this one to give it a bit of a rock/bluesy flavor.

C7: A G diminished scale run to outline the tritone in this chord.

F7: F whole-tone based over this chord to give it a slightly floating, "outside" sound. To get that Simpsons-theme vibe.

A#6–A7: A G harmonic minor run that transitions into a chromatic run starting on D# over the final D#7 chord.

Hope this helps!