anchor: Call me old-fashioned for caring, but increased popular music sales typically lead to increased classical or jazz music sales, due mainly to the effect of people feeling compelled to enter a music store and look around to see what's new since they were there to buy Thriller , or the Titanic soundtrack, or whatever got them in the door the last time.
positive: Increased classical or jazz music sales are done because there is a high popularity.
negative: People don't enter music stores to buy known soundtrack.