João Carlos Martins has been an interesting pianist over the years. He recorded much Bach perhaps forty years ago (since reissued) and it was worth some attention although quite individualistic and a good bit out of the mainstream. This disc is newer and shows Martins's technique to have diminished considerably. There is, frankly, nothing here that hasn't been recorded better by others. Probably the best thing here is the familiar short Scriabin Nocturne, Op. 9, No. 2. The Saint-Saëns études, however, are awkwardly cautious. The Bach/Brahms Chaconne has some expressive depth but has been better done by such pianists as Leon Fleisher.
The Ravel D Major Concerto is simply a throw-away. Accompanied by Boris Spassov leading the Bulgarian National Symphony, this performance is really dreadful. The orchestra is bush-league and Martins's playing includes bunches of wrong notes.
Avoid this one.