The album title for a Classical album should include the last name of the composer, followed by the work title. (It is also acceptable to use the first initial of the composer followed by the last name, followed by the work title.)
Mozart: "Toy" Symphony in G Major
J. Bach: Trio sonata in C Minor
If there are two composers and the work is in the same genre and/or style of pieces, then both composers can be listed before the work title.
Mozart & Haydn: String Quartet
If the pieces are different from each other, then they must be separated by a hyphen.
Allegri: Miserere – Palestrina: Missa Papae Marcelli
If there are different works by many composers on an album, then all composers should be listed in the work title.
Composer 1: Piece – Composer 2: Piece – Composer 3: Piece