 Examples of that difference include a piano (a keyed zither) and a violin (referred to by some as a species of fingerboard lyre).Some specialists even argue that instruments such as the violin and guitar belong to a class apart from the lyre because they have no yokes or uprights surmounting their resonators as "true" lyres have.This group they usually refer to as the lute class, after the instrument of that name, and include within it the guitar, the violin, the banjo, and similar stringed instruments with fingerboards.