This is the 854th most frequent Russian word.
языке
The Russian word "языке" is the prepositional case of "язык," meaning "language" or "tongue."
Here, 'языке' refers to the means of communication being used to study, specifying 'in the language' (of the original).
Я изучаю русский язык на языке оригинала.
I study Russian in its original language.
In this sentence, 'языке' refers to the medium of speech, highlighting the cultural heritage.
Мы говорим на языке наших предков.
We speak the language of our ancestors.
In this example, 'языке' metaphorically represents the means of expressive communication, in this case, music as a 'language'.