I know from whence you come Fran. Sometime between 2004 and 2008, I entered the chords from Dick Hyman’s books of jazz chord changes and substitutions for about 100 “standards”. Converted them to midi files and still occasionally use them for cocktail hours and such. Not having a formal music education, it was/is what I needed to get closer to the level of you conservatory grads … I just play or sing the lead over a very nice background quartet.