Question

The piano trio has been a popular instrument since the middle of the _______ century.    19th is wrong

Answer 1

The piano trio has been popular since the nineteenth century, especially during the Romantic era.

Step-by-step explanation:

The piano trio has been a popular instrument since the middle of the nineteenth century. The Romantic era, which spans the nineteenth and early twentieth century, saw the rise of the piano trio as a favored ensemble. Composers during this time, such as Beethoven and Schubert, wrote numerous piano trios that became staples of the repertoire.

Answer 2

I believe that would be the 18th Century