Of his 80 published compositions , nearly half are now available on CD , the most popular being the Overture The Naiades Op 15 , the Chamber Trio Op 26 and the Piano concerto No 4 in F minor Op 19 . Of a total of some 80 published compositions . nearly a half are currently available on CD , the most popular being the overture The Naiades Op 15 , the Chamber Trio Op 26 , and the Piano Concerto No. 4 , Op 19 .