the middle class and music revival

the middle class and music revival. Major topics as economic development, the middle class developed, advanced tools to produce music. Urban population growth, etc., to promote the consumption of music. Makes music at this stage has been a huge development. Musicians can live performance for the high life, more music to the masses.

third,

1, seismic waves. One is p, one is s. p propagation in a straight line, and through a variety of substances. s go s line, so slow, liquids and gases do not pass through. There is also a ground wave, a tremendous impact to the surface.

1, an article about butterfly biology, and talked about a kind of color is very bright butterfly benefits. Birds eat investigation say it once and then will remember its features will not eat it.

2, I remember reading an article about the Renaissance, when the music, talked about upgrading the status of middleclass.

3, there is a talk about the earthquake waves generated by it ... primaryand second. , There is a surface wave is the most damaging, the word exam invade the answer is there is a limit