3 5 6 (which can be also played as 1 2 4 5 6 1 2) in the traditional Chinese number system or jianpu (i.e. 1=do, 2=re, etc.). Today this is generally interpreted to mean C D F G A c d, but this should be considered sol la do re mi sol la, since historically the qin was not tuned to absolute pitch. Other tunings are achieved by adjusting the tension of the strings using the tuning pegs at the head end. Thus manjiao diao ("slackened third string") gives 1 2 3 5 6 1 2 and ruibin diao ("raised fifth string") gives 1 2 4 5 7 1 2, which is transposed to 2 3 5 6 1 2 3. Playing context The guqin is nearly always played as a solo instrument since its quietness of tone means that it cannot compete with the sounds of most other instruments or an ensemble. It can, however, be played together with a xiao (end-blown bamboo flute), with other qin, or played while singing. In old times, the se (a long zither with movable bridges and 25 strings) was frequently used in duets with the qin. However, the se has not survived, though duet tablature scores for the instruments are preserved in a few qinpu, and the master qin player Wu Jinglüe was one of only a few in the twentieth century who knew how to play it together with qin in duet. Lately there has been a trend to use other instruments to accompany the qin, such as the xun (ceramic ocarina), pipa (four-stringed pear-shaped lute), dizi (transverse bamboo flute), and others for more experimental purposes. In order for an instrument to accompany the qin, its sound must be mellow and not overwhelm the qin. Thus, the xiao generally used for this purpose is one pitched in the key of F, known as qin xiao 「琴簫」, which is narrower than an ordinary xiao. If one sings to qin songs (which is rare nowadays) then one should not sing in an operatic or folk style as is common in China, but rather in a very low pitched and deep way; and the range in which one should sing should not exceed one and a half octaves. The style of singing is similar to that used to recite Tang poetry. In order fully to appreciate qin songs, one needs to become accustomed