Create MIDI files from scores

I have old books with folk songs. Mainly 1 voice for cocals plus piano (left + right hand). Sometimes choir arrangements with 2x 2 voices(SATB). I need midi files with three tracks, meaning piano left and right in seperated tracks. Each song = 1 midi file As I have many books like that I would like to do projects with 50 or 100 songs. Most of them are one song on one A4 size page, but some are longer. Countings bars might be more work than sense. Thus bid on a basis of 50 songs or make clear in your bid how you want to count the amount of work.