Baby boomers are an example of what type of trend?

If you talk about trend, baby boomers are those who just age and retire.  They do best to remain active and stay fit.  They are very independent and are all prone to go into business for themselves.  They are now very much in demand in society.

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

lives by a moral and ethical code