Tanaga

The Tanaga is an indigenous type of Filipino poem, that is used traditionally in the Tagalog language.
Format.
The Tanaga consists of four lines with seven syllables each with the same rhyme at the end of each line --- that is to say a 7-7-7-7 Syllabic verse, with an AABB rhyme scheme.
In the Tagalog original, using archaic orthography:<br>
"Catitibay ca tolos"<br>
"sacaling datnang agos!"<br>
"aco’I momonting lomot"<br>
"sa iyo,I popolopot."<br>
In the modern Tagalog orthography:
"Katitibay kang tulos"<br>
"Sakaling datnan ng agos!"<br>
"Ako'y mumunting lumot"<br>
"sa iyo'y pupulupot."<br>
Translation:
"Oh be resilient you stake"<br>
"Should the waters be coming!"<br>
"I shall cower as the moss"<br>
"To you I shall be clinging."<br>
The above Tanaga is attributed to Friars Juan de Noceda and Pedro de Sanlucar by Vim Nadera, and quoted them as saying “Poesia muy alta en tagalo, compuesta de siete silabas, y cuatro versos, llena de metafora.” (16th century) ("Poetry is quite high in Tagalog, composed of seven syllables, and four verses, full of metaphor.") 
Like the Japanese haiku, Tanagas traditionally do not have any titles. They are poetic forms that should speak for themselves. Most are handed down by oral history, and contain proverbial forms, moral lessons, and snippets of a code of ethics.
A poetic form similar to the tanaga is the ambahan. Unlike the ambahan whose length is indefinite, the tanaga is a compact seven-syllable quatrain. Poets test their skills at rhyme, meter and metaphor through the tanaga, not only because is it rhymed and measured, but also it exacts skillful use of words to create a puzzle that demands some kind of an answer.
It is almost considered a dying art form, but is currently being revived by the Cultural Center of the Philippines and National Commission of the Arts. Poetry groups, like the PinoyPoets, have been promoting Filipino poetry in English; the vernacular are also advocating the spread of this art form.
Modern form.
The modern Tanaga still uses the 7777 syllable count, but rhymes range from dual rhyme forms: AABB, ABAB, ABBA; to freestyle forms such as AAAB, BAAA, or ABCD. Tanagas do not have title traditionally because the Tanaga should speak for itself. However, modern writers may opt to give them titles. 