I am working through your suggestions for starting to improvise. In the key of C I used a quarter note rhythm of R-5 to R-6 in the left hand with the appropriate chord of C, F7 or G7 in the right hand. However when I go to the blues scale, there are certain notes that to me don’t sound good, especially when playing whole notes or half notes. For example over a C chord the F and G-flat notes do not sound right. Are there certain notes in the blues scale that should function only as passing tones over certain chords?

Thanks