From WILL - Classics of the Phonograph -

Double and Triple Concertos

Concertos for multiple instruments were very popular in the 18th century. But in the 19th century, the solo concerto became dominant, because of the rise of superstar performers. Brahms successfully bucked the trend with his Concerto for Violin and Cello, but Beethoven had one of his few failures with his Triple Concerto. But our century has reversed that judgment. We'll hear from both these works.