Read the following paragraph and then answer the questions. There are several ways that recording companies and artists themselves can create successful music careers. Both recording companies and individual artists can make high-quality recordings available to consumers, usually in the form of tapes and CDs. In addition, recording companies provide promotion of these works; likewise, an individual artist wants to promote his or her own work as much as possible. Just as a recording company will advertise an artist’s recordings to as large an audience as possible and sometimes provide promotional tours, an artist will also try to do the same when working on his or her own. In addition, a recording company will sell the music it records for a profit and give a percentage of that money to the artist in payments known as royalties; similarly, an artist will try to sell his or her own work for profit. Thus, there are several things that both recording companies and individual artists will do in order to try to establish their work in the industry. From 《高级实用英语写作》 What is the topic sentence of the paragraph? What is the method of development? Cause and effect? Comparison? Or definition? To support the topic sentence, from how many aspects does the author explain? What is the concluding sentence?