This is not the only time in the 20th century that musicians attempted to introduce more modern elements into classical music, although it may be the only instance of new compositions.
In the 1960s and 1970s, existing classical pieces were adapted using sounds more identifiable with those decades.
For example, Minuet in G was redone as The Lovers Concerto, including adding lyrics.
In the 1970s, more jazzed up versions of classical favorites were popular. Many think this was done in an attempt to get young people to better identify with and appreciate the classics.