Try some Mozart sonatas?Ideally you should be able to play a legato passage legato without the pedal. Unfortunately I can't really explain how to practice legato- to me it's all in the ear (which, from a technical standpoint at least, makes absolutely no sense whatsoever ).
the Italian concerto by Bach? .
Very difficult. Bach + mozart.
Haw to achieve perfect legato according to Horowitz. Start by holding down the middle C with your thumb, then hold down the following D with your third finger thus the note C and D are held down together. Finaly move your thumd under the third finger wilst holding down the note D with the third finger , the objective is to play the follwing E with the third finger as soon as the thumb lands on the note D. Therefore creating the illusion of perfect legato.
The dampers of each note play a significant part in legato playing and learning how to manipulate them smoothly is one of the mechanical components in the production of a smooth transition from tone to tone - id est: legato. The dampers must damp each string slowly so the resonance of the strings do not silence abrubptly. When this is achieved there is no accent on the note silenced allowing the next note to sound without the competition of attention of the ear. This is just one aspect.