Tension & Release If you find when you solo over certain chords using scales other than the major and minor pentatonic or blues scales, that your soloing is disjointed, lacks continuity and coherence then read on. One of the most important aspects of good improvisation is the use of tension and release. The first place to start is getting to know which notes in a scale are the tension and release notes. Lets look at the C major scale.
If you play the note C over a C major chord you can hear that it is a safe note, maybe even a bit dull, it's not considered a tension note.
The 2nd has a leaning towards the 1st.
The 3rd note is deemed to be consonant.
The 4th note creates some tension and has a tendency to want to resolve to the 3rd.
The 5th is deemed to be consonant.
The 6th is deemed to be consonant.
The 7th is a tension note with an impulse towards the 8th.