'The fourth Symphony of Sibelius can be compared to a species of star, which [Physicists and Astromoners] call a white Dwarf, the substance of which is so dense and compressed that a piece the size of a shilling may weigh as much as several tons'.--Cecil Gray, Sibelius biographer.
This is a pretty good analogy of Sibelius 4. Sibelius somehow developed a kind of musical shorthand. The music is reduced to a mighty minimum, by rejecting all inessentials combined with an amazing power of suggestion, Sibelius creates worlds.--kp