Just a note on that chord. Shigeki correctly identifies it...it can be either a 7th chord with the flatted 5th, or a 7th chord with the ninth and then the #11 tone stacked on top. That last one is the one I was using.

I listen to a lot of Brazilian music, and this chord come very naturally out of that. The reason is based on the reliance of the Spanish or classical guitar used as the primary rhythm instrument in bossa nova. When you finger a chord like C9, you bar the strings, then use your fingers to create the chord ahead of the bar, but the “bar” leaves the highest (bottom) string sounding at the #11 tone (in the case of a C9, the #11 would be an F sharp). It creates a very interesting leading tone, or, if left “hanging”, adds a nice mystical feeling.

Windows 11, Intel Core i5-8600T 2.3Ghz, 16 gig ram, BIAB 2025 MegaPak, SampleTank 4, Keystation49 Kybd, Neewer NW-800 mic