The instrument most commonly associated with Wales is the harp, which is generally considered to be the country's national instrument. Though it originated in Italy, the triple harp ("telyn deires", "three-row harp") is held up as the traditional harp of Wales: it has three rows of strings, with every semitone separately represented, while modern concert harps use a pedal system to change key by stopping the relevant strings. After losing ground to the pedal harp in the 19th century, it has been re-popularised through the efforts of Nansi Richards, Llio Rhydderch and Robin Huw Bowen. The penillion is a traditional form of Welsh singing poetry, accompanied by the harp, in which the singer and harpist follow different melodies so the stressed syllables of the poem coincide with accented beats of the harp melody.