Whilst, Schubert apart, these composers certainly knew each other (with Haydn and Mozart even being occasional chamber-music partners), there is no sense in which they were engaged in a collaborative effort in the sense that one would associate with 20th-century schools such as the Second Viennese School, or Les Six. Nor is there any significant sense in which one composer was "schooled" by another (in the way that Berg and Webern were taught by Schoenberg), though it is true that Beethoven for a time received lessons from Haydn.