There is an astonishingly wide variety of classical music on CD now; the sheer amount and variety is little short of mind-boggling.
But unfortunately, many orchestras around the world tend to stick to the tried-and-true familiar masterpieces of Mozart,Beethoven,Schubert,Mendelssohn,Schumann,Brahms,Tchaikovsky,and Dvorak etc, with some notable exceptions.
Orchestras have to sell as many tickets as possible to stay alive, and many concertgoers are unfortunately reluctant to hear not only new works by today's composers, but lesser-known ones from the past which are undeservedly neglected, which is a pity.
But the works of such lesser-known composers as Franz Berwald, Mily Balakirev, Zdenek Fibich, Sergei Taneyev, Wilhelm Stenhammar, Arnold Bax, Franz Schmidt, Ferruccio Busoni, Nikolai Myaskovsky, Hans Pfitzner, Albert Roussel,Alberic Magnard, Karol Szymanowski, Arthur Bliss,George Whitefield Chadwick, and others has much to offer audiences today.
Fortunately,we can easily obtain recordings of their music, but why don't more conductors program their music at live concerts? There are some notable exceptions,such as Neeme Jarvi and his son Paavo, Vladimir Jurowski, Gerard Schwarz, Leonard Slatkin, Alan Gilbert and several others, but too many conductors are content to give us the same old same old.
The composers I listed above are only the tip of the iceberg.