Caña can be considered as the most important base of cante of flamenco. Its melodic influence can be perceived not only in many minor cantes, but also in some old styles which are frequently considered as originals. 

Some prestigious opinions put Soleás and even Seguiriya as the older cantes than Caña. However, Soleá could be the one which segregated from Caña. 
Caña, which people use and cover all the repertoire of the voice, is extremely difficult to sing and it requires, to be expressed with purity, not only a perfect knowledge of the style, but also vocal faculties of expression.