My solos are speech-influenced rhythmically; and harmonically, they're either pentatonic, or poly-scale oriented. And there's the mixolydian mode tha… - Frank Zappa

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My solos are speech-influenced rhythmically; and harmonically, they're either pentatonic, or poly-scale oriented. And there's the mixolydian mode that I also use a lot...But I'm more interested in melodic things I think the biggest challenge when you go to play a solo is trying to invent a melody on the spot.