That is - increasing ease of recording and transmission of cultural artifacts has homogenised that output, and reduced the urge and ability of individuals to preserve and pass on that output.
Used to be, almost everyone learned to play an instrument. Families would play together around the fire, or children who excelled would be invited to perform to entertain at their parents' party.
Sheet music was the "Top 40" of the pre-Edison days, and people made good livings writing it.
OTOH, mixes and remixes, greatly spurred by innovations in rap, have proliferated in the last 30 years. But that's not the same pervasive skill set in society.