Altered jazz guitar lines
Medodic Minor Scale And Altered Dominant Seventh Chords - Guitar Lesson With Free PDF and Short Video
This guitar lesson provides 10 easy exercises for understanding the relationship between the Melodic Minor Scale and altered dominant seventh chords. This is a free course (or give what you want) with a printable PDF with tab/standard notation and a YouTube short video.
When you want to play altered jazz guitar lines over a dominant 7th chord, there is an easy and efficient option that is to play a major triad starting on the #11 of the chord you want to improvise over. This way you highlight the b7, #11 and b9 and add tension to your playing.
Let's take an example with a II-V-I sequence in the key of C major. The progression is Dm7 | G7alt | CMaj7.