i want to know, of the total amount of songs available to download on
itunes, how many, and what percentage of the total songs, are latin
music -- fall under the genre of latin music or are promoted in the
latin genre area? the songs can be in spanish or english.

Many songs are clearly latin, but others even with lyrics in Spanish
are possibly another genre or two. Does latin include Portugess as in
Brazil? Some of the music of Spain is quite different than that of
South America, Central America and Mexico, just as some British music
is different than USA, India, Bermuda, Canada, New Zeland and
Austrailian music. Does itunes only have modern popular music? Perhaps
opinions very widely on the percent of latin music. Likely Italian
music is classed as latin by few people.   Neil