Alternate picking is a guitar playing technique that employs alternating downward and upward strokes in a continuous fashion. If the technique is performed at high speed on a single string or course voicing the same note, it may be referred to as "tremolo picking" or "double picking". Most scalar runs are most easily played using alternate picking. Similarly, the complex, syncopated rhythm guitar patterns found in death metal require a good alternate picking technique to play fast and accurately.