Pop music is a genre of popular music that originated in its modern form in the United States and United Kingdom during the mid-1950s. The terms "popular music" and "pop music" are often used interchangeably, although the former describes all music that is popular and includes many styles. "Pop" and "rock" were roughly synonymous terms until the late 1960s, when they became increasingly differentiated from each other. 

Although pop music is seen as just the singles charts, it is not the sum of all chart music. Pop music is eclectic, and often borrows elements from other styles such as urban, dance, rock, Latin, and country; nonetheless, there are core elements that define pop music. Identifying factors include generally short to medium-length songs written in a basic format (often the verse-chorus structure), as well as common use of repeated choruses, melodic tunes, and hooks. 

David Hatch and Stephen Millward define pop music as "a body of music which is distinguishable from popular, jazz, and folk musics". According to Pete Seeger, pop music is "professional music which draws upon both folk music and fine arts music". Although pop music is seen as just the singles charts, it is not the sum of all chart music. The music charts contain songs from a variety of sources, including classical, jazz, rock, and novelty songs. Pop music, as a genre, is seen as existing and developing separately. Thus "pop music" may be used to describe a distinct genre, designed to appeal to all, often characterized as "instant singles-based music aimed at teenagers" in contrast to rock music as "album-based music for adults". QUESTIONS:

Q1:
1. What terms are often used interchangeably?
2. What words often get used synonymously?
3. Which terms do people often use to mean the same thing?
Q2:
1. Don't popular music and pop music mean the same thing?
2. Isn't there no difference between popular music and pop music?
3. Are popular music and pop music not exactly interchangeable?
Q3:
1. What's the difference between popular music and pop music?
2. How are popular music and pop music difference?
3. How is Pop music any different from popular music?
Q4:
1. Can pop and rock be used interchangeably?
2. Do pop and rock refer to the same style of music?
3. Is the same style of music called both rock and pop?
Q5:
1. Did rock and pop used to be the same thing?
2. Did the terms pop and rock once refer to the same styles of music?
3. Was the same thing once meant by pop and rock?
Q6:
1. When were pop and rock more or less interchangeable?
2. When did pop and rock roughly refer to the same styles of music?
3. At what point did pop and rock mean the same thing?
Q7:
1. Who is the first man that the article mentions by name?
2. What is the first man mentioned by name in the article?
3. Which man's name gets referenced first in the article?
Q8:
1. What does David Hatch think?
2. What is David Hatch's opinion?
3. What opinion does David Hatch give?
Q9:
1. Does anyone agree with David Hatch?
2. Does anyone think that David Hatch is correct?
3. Does David Hatch have any supporters of his opinion?
Q10:
1. Who agrees with David Hatch?
2. Who thinks that David Hatch is correct?
3. Who shares David Hatch's opinon?
Q11:
1. Is anyone besides David Hatch and Stephen Millward mentioned?
2. Does the article mention anyone other than David Hatch and Stephen Millward?
3. Is anyone else named in the article apart form David Hatch and Stephen Millward?
Q12:
1. Who does the article mention besides David Hatch and Stephen Millward?
2. Whose name appears in the article besides David Hatch and Stephen Millward?
3. In addition to David Hatch and Stephen Millward, whose opinion does the article cite?
Q13:
1. Does Peter Seeger agree with David Hatch?
2. Does Peter Seeger share David Hatch's definition of pop music?
3. Do David Hatch and Peter Seeger have the same definition of pop music?
Q14:
1. What does Peter Seeger think of Pop Music?
2. What is Peter Seeger's opinon of pop music?
3. How does Peter Seeger define pop music?
