. >> reporter: dr kendall lee performed brain surgeries to address movement disorders for more than a decade. what exactly is deep brain stimulation. >> it is state of the art technologies where they implant electrodes and treat disorders like obsessive compulsive disorder. tour et cetera syndrome. >> reporter: dr lee has seen dramatic results. like the case of minnesota orchestra. he developed a tremor making it impossible to perform. >> we have to, you can only notice the tremor when he played the soil join. >> reporter: dr lee had him play his instrument while he tested the electrodes in his brain, to make sure they were on target. when the electrodes were turned on, the tremor vanished. and they were able to play. what was that like to hear the murk light up the or. >> it was amazing. this gentleman was a concert master, he had to get the music perfect. he inserted it perfectly. when he did that he got the perfect note. >> reporter: that's cool. >> very cool. >> reporter: dr lee will perform a similar procedure on jennifer. she said it's her last hope for a better life. when we co