Multiple realities
(covers information from several alternate timelines)
Classical music was a term used to describe music from bygone eras on Earth.
In the alternate reality in the year 2263, Doctor Leonard McCoy referred to "Sabotage" by the 20th century American hip hop group Beastie Boys as classical music. (Star Trek Beyond)
In 2380, Barnes told Sam Rutherford that she liked the classical band The Monkees. (LD: "Second Contact")