Watch the Mixolydian & Dominant online guitar lesson by Jennifer Batten from Rock Sauce For Lead Guitar
The mixolydian mode is my favorite and is used most commonly to solo over dominant 7th chords. I like to combine a minor blues scale with the mixolydian mode because it gives me 9 notes to choose from instead of the 5 from a pentatonic scale or 7 from a diatonic scale. The mixolydian mode is important to know for the blues. Once you have a handle on the scales from segment 1, 2 and 3, you're good to go. You can get many years of mileage out of them. Loads of players have made entire careers from that information alone, and never add anything else.