1. "Piano Department" is an independent department of the Conservatory of Music. Belongs to the "instrumental music" department. (Some colleges include the "accordion" major in the "piano department".)
2. "Instrumental music" departments also include "orchestral department" and "folk music department".
The above 1. and 2., in layman’s terms, are departments that cultivate “performers”.
3. "Musicology" is a "theoretical" department. Its professional directions are: introduction to music, music history, music aesthetics (philosophy), music sociology, music physics and other theoretical categories.