Answer:
The musicians are actually spontaneously creating a very intricate form of theme and variation; they all know the tune and the role of their instrument. The guitar, piano, bass and drums, while all able to solo, basically provide the rhythm and harmony over which the soloist will create improvised variations.
Explanation:
Before the 15th century when the printing press was invented, art and literature was only made available to rich individuals who could afford it. The reason the prices were so high is because artists would labor over their peices and it would take months to complete one work. However, with printing, artists were able to create one work and copy it with consistant results. This way they could mass produce one artwork and sell it cheaply, making it so that anyone could easily purchase art for their homes.
best of luck! :)
