What is the difference between lyre and harp and guitar?
 The lyre is a string instrument known for its use in Greek classical antiquity and later periods, the guitar is the pear-shaped body of the lute, which is produced by gluing ribs of wood together and then gluing the soundboard on top and a harp is a guitar, in any of its accepted forms, with any number of additional floating unstopped strings that can accommodate individual plucking. 