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In addition to Grondy's answer about Quenya, there is good reason why Sindarin has replaced it as the main elvish language in MiddleEarth. Originally all elves spoke one language which was similar to Quenya. When the Noldor and Vanya went into the West, however, the language developed different dialects between those in the West and those that remained in MiddleEarth. Over time these dialects developed into two distinct languages, Quenya and Sindarin.
When the Noldor returned to MiddleEarth they spoke Quenya but when Elwe (Thingol) learned of the Kinslaying at Alqualonde (his kin), he barred anyone from speaking Quenya within his realm. After this time, Quenya became more a language of lore and was not used in public.
It is a beautiful language with liquid syllables suited to songs and poetry.