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OK, this could be difficult if you've never improvised... when you improvise you want to play scales/melodies that fit with the chords being played and their progression. Best way to practice this is to stick on a jazz CD, listen to their improvisation and try to do something similar. Play over the CD and try to fit what you play with the chords. For a duel, it's going to be a call and response kind of thing. If the other guy starts with something, try and respond in a similar way/ out do him.

Watch this video and listen to the way that miles davis and the guitarist take it in turns to improvise. Notice the way they copy each other, but change it slightly each time? This is the kind of thing you want to achieve... http://www.youtube.com/watch?v=SGh1beX3C7s&ob=av2n

First, comprehend the chord ameliorations for the track. in case you are able to, get a recording, ideally basically the rhythm section, so which you will prepare. in case you won't be ready to get that, it fairly is effective. Get a metronome and basically play the scales over the chords. (If the ameliorations go too speedy, then basically play part of the size). Then do an identical with arpeggios (a million-3-5, a million-3-5-7 notes of the size, etc). once you're soft doing that and comprehend the chord ameliorations, basically play some thing. Then attempt some thing else. in case you're having a stressful time thinking of a melody, basically pay attention the chord progression and make some thing up, via buzzing and, in case you choose, then enjoying what you hummed. yet another technique is to take that a step extra and unquestionably write out a solo, play it. The write out yet another, and you will start to strengthen words you choose to apply once you improvise. submit to in techniques improvisation is basically spontaneous composition, in spite of each little thing. in particular, have exciting.