Pressure is force over area. So assuming your cube is at rest and on earth, then the force is mass x gravity and the pressure is mass x gravity / area.
A string quartet is made up of four musicians playing two violins, a viola, and a cello. These are all string instruments played either by plucking the strings or using a bow. The violins are the smallest and typically play the higher notes. The viola and cello are larger instruments and play the lower notes.
Franz Schubert: String Quartet No. 15 in G major, D. 887. Quartetto Italiano. Though he only has four instruments to work with instead of a whole orchestra, Schubert's last quartet is just as long and intense as his last symphony.