A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text. It gives a broad overview of how music is consumed today. It does not refer to any previous information. Why other lines are not chosen? Paragraph 2 starts with "There are" which makes it dependent on prior context. Paragraph 3 starts with "They say" which also needs prior information. Paragraph 4 starts with "New singers" which is specific and assumes knowledge of the topic. Paragraph 5 starts with "Furthermore" which shows it is adding to a previous idea.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion by giving another important point about online music. It summarizes the issues raised in the previous paragraphs and shows the overall theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it discusses the criticisms of the new method of playing songs. This shows a logical order where the first paragraph introduces the topic and the second gives the criticisms.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives a specific criticism mentioned in the second paragraph. This shows a logical order where the second paragraph introduces the criticisms and the third gives one example of those criticisms.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the consequences of the lower payments mentioned in the third paragraph. This shows a cause and effect relationship where the low payments lead to struggles for new artists.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it adds another criticism about the quality of online music. The word "Furthermore" shows that it is adding to the previous point about the problems with online music.