Benny Green is well known for his extremely fast double handed bebop lines. Here is one of them from Just A Tadd. It takes a long time to get your LH as strong as your RH, but Benny has obviously done it, and it sounds awesome! To work on double handed lines like this one, you must practice LH alone so it is not mirroring movements. It needs to be just as strong as the right viagra pris.