01 weekly topics: The sound of music.- Tunig peg: music vocabulary

15-04-2011. Tuning peg. TODAY'S VOCABULARY WITH IMAGES OR PICTURES. 05.

tuning peg [countable]

a screw used for making the strings on a guitar etc tighter or looser

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
learn more about guitars: 
http://www.electricguitarplanet.com/2008/04/06/guitar-parts-basic/