I created a video that demonstrates how to simplify the tune I Thought About You into just one major kay in order to make improvisation much easier over the tune.
Two rhythm tracks were created for the video that I will link below the video.
Rhythm track for Eb major. The chords alternate between Eb major and Bb7, but just think three flats:
Here's the rhythm track for the tune, I Thought About You (in Eb concert):