The songs of the Troubadours were in many cases taken directly from Eastern models. In early Arabian times it was customary for two shepherds to converse in music by intoning responsive phrases on their flutes; and it soon became customary for two minstrels to sing in like manner. In the early songs of the Bible, too, are many verses whose second half answers the first, and, in fact, the Hebrew words for "answer" and "sing" are said to be identical. Among the Troubadours, this species of musical dialogue took the form of the tenson, or contention. The use of answering couplets in solo songs is another point of resemblance. Another favourite Arabian form was the casida, or stanza constructed with only one rhyme, and the rich and melodious Provencal tongue lent itself excellently to poems of this structure. So successful were the Troubadours in using it that sometimes their compositions were over a hundred lines in length. The short but brilliant Arabian lyrics, called "Maouchah," or embroidery, were well imitated by dainty and sparkling lyrics of the Troubadours. The Oriental mourning song became the Planh, or dirge. The evening tribute of the Arabian minstrels to their chosen loves became the serenade, while the Troubadours went still further in this vein by originating the aubade, or morning song. Among the other forms used, the verse was merely a set of couplets, the chanson was divided into several stanzas, while the sonnet was much freer in form than at present. When more than two singers took part in a tenson, it became a tournament. The sirvente was a song of war or politics, sometimes satirical, sometimes in praise of the exploits of a generous patron. The sixtine contained six stanzas of six lines each, with the rhymes holding over from one stanza to the next, and occurring in a different order in each stanza. The rhymes in the sirvente differed from what we consider correct by consisting always of a repetition of the same word. The discord was a sort of free fantasia, sometimes in several dialects. The pastorelle was of pastoral character, usually consisting of short lines and containing a dialogue. Among the more narrative forms are found the ballad, more especially favoured by the Trouveres, or minstrels of the "Langue d'oil" regions. It gave rise to the various metres used in the epics, and sometimes formed the basis of these longer works. In general, the Trouveres devoted themselves to fiction and story, while their southern brethren sang of love. The novel, used largely in the south, was a short poem containing some brilliant anecdote of gallantry, couched in neat phrase. The romance, or long narrative, was by reason of its size the most permanent of all the poetry of this age. Though written by both Troubadours and Trouveres, the latter were far superior in style and invention, and it is mostly their work which has survived. These romances were sometimes in prose, but more often in poetry of extremely smooth and flowing metre.