Somebody should, somebody did

Random thought while listening to Schubert’s Unfinished Symphony.

Somebody should write an Overly Finished Symphony with too many shimmering glissandos and silvery cornets. Or an Unassembled Symphony, with instructions to Insert Trumpet A in Rest B. Or a Lego Symphony, modules that could be assembled in various ways.

Come to think of it, real composers did use the Lego method. Bach and Mozart and Handel reused modules all the time. The third movement of a harpsichord concerto becomes an aria in a cantata, or an overture for an opera.