It appears that three classical composers have been typed by recognized Soconists:

Chopin - INFp. Agreed...I've generally seen Chopin as

Shostakovitch - INTp. Agreed...Clearly with strong sense of dual reflected in his music.

Rachmaninoff - INTj. I understand why they say that; I have trouble with it though; maybe it's because Rachmaninoff followed the example of Schumann and Tchaikovsky in seeking to disguise the influence of T. Does anyone think Delta NF for Rachmaninoff?

Here are some others I propose:
[EDIT: J.S.] Bach: INTj
[EDIT: C.P.E Bach: ENTp]
Handel: ESTj
Mozart: ENFp
Tchaikovsky: ESFj
[EDIT: Felix] Mendelssohn: ENTj
Beethoven: ISFp (although sometimes I hear his music as if with very strong )
Liszt: ESFp